Algebra Examples

$\ln (2 x^{2} - 3 y^{2}) + \tan (\sqrt{x^{2} + y^{2}}) + \frac{x}{y^{2}}$

Step 1

By the Sum Rule, the derivative of $\ln (2 x^{2} - 3 y^{2}) + \tan (\sqrt{x^{2} + y^{2}}) + \frac{x}{y^{2}}$ with respect to $y$ is $\frac{d}{d y} [\ln (2 x^{2} - 3 y^{2})] + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$ .

$\frac{d}{d y} [\ln (2 x^{2} - 3 y^{2})] + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2

Evaluate $\frac{d}{d y} [\ln (2 x^{2} - 3 y^{2})]$ .

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Step 2.1

Differentiate using the chain rule, which states that $\frac{d}{d y} [f (g (y))]$ is $f' (g (y)) g' (y)$ where $f (y) = \ln (y)$ and $g (y) = 2 x^{2} - 3 y^{2}$ .

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Step 2.1.1

To apply the Chain Rule, set $u_{1}$ as $2 x^{2} - 3 y^{2}$ .

$\frac{d}{d u_{1}} [\ln (u_{1})] \frac{d}{d y} [2 x^{2} - 3 y^{2}] + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.1.2

The derivative of $\ln (u_{1})$ with respect to $u_{1}$ is $\frac{1}{u_{1}}$ .

$\frac{1}{u_{1}} \frac{d}{d y} [2 x^{2} - 3 y^{2}] + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.1.3

Replace all occurrences of $u_{1}$ with $2 x^{2} - 3 y^{2}$ .

$\frac{1}{2 x^{2} - 3 y^{2}} \frac{d}{d y} [2 x^{2} - 3 y^{2}] + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.2

By the Sum Rule, the derivative of $2 x^{2} - 3 y^{2}$ with respect to $y$ is $\frac{d}{d y} [2 x^{2}] + \frac{d}{d y} [- 3 y^{2}]$ .

$\frac{1}{2 x^{2} - 3 y^{2}} (\frac{d}{d y} [2 x^{2}] + \frac{d}{d y} [- 3 y^{2}]) + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.3

Since $2 x^{2}$ is constant with respect to $y$ , the derivative of $2 x^{2}$ with respect to $y$ is $0$ .

$\frac{1}{2 x^{2} - 3 y^{2}} (0 + \frac{d}{d y} [- 3 y^{2}]) + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.4

Since $- 3$ is constant with respect to $y$ , the derivative of $- 3 y^{2}$ with respect to $y$ is $- 3 \frac{d}{d y} [y^{2}]$ .

$\frac{1}{2 x^{2} - 3 y^{2}} (0 - 3 \frac{d}{d y} [y^{2}]) + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.5

Differentiate using the Power Rule which states that $\frac{d}{d y} [y^{n}]$ is $n y^{n - 1}$ where $n = 2$ .

$\frac{1}{2 x^{2} - 3 y^{2}} (0 - 3 (2 y)) + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.6

Multiply $2$ by $- 3$ .

$\frac{1}{2 x^{2} - 3 y^{2}} (0 - 6 y) + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.7

Subtract $6 y$ from $0$ .

$\frac{1}{2 x^{2} - 3 y^{2}} (- 6 y) + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.8

Combine $- 6$ and $\frac{1}{2 x^{2} - 3 y^{2}}$ .

$\frac{- 6}{2 x^{2} - 3 y^{2}} y + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.9

Combine $\frac{- 6}{2 x^{2} - 3 y^{2}}$ and $y$ .

$\frac{- 6 y}{2 x^{2} - 3 y^{2}} + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 2.10

Move the negative in front of the fraction.

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3

Evaluate $\frac{d}{d y} [\tan (\sqrt{x^{2} + y^{2}})]$ .

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Step 3.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x^{2} + y^{2}}$ as ${(x^{2} + y^{2})}^{\frac{1}{2}}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{d}{d y} [\tan ({(x^{2} + y^{2})}^{\frac{1}{2}})] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.2

Differentiate using the chain rule, which states that $\frac{d}{d y} [f (g (y))]$ is $f' (g (y)) g' (y)$ where $f (y) = \tan (y)$ and $g (y) = {(x^{2} + y^{2})}^{\frac{1}{2}}$ .

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Step 3.2.1

To apply the Chain Rule, set $u_{2}$ as ${(x^{2} + y^{2})}^{\frac{1}{2}}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{d}{d u_{2}} [\tan (u_{2})] \frac{d}{d y} [{(x^{2} + y^{2})}^{\frac{1}{2}}] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.2.2

The derivative of $\tan (u_{2})$ with respect to $u_{2}$ is $\sec^{2} (u_{2})$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} (u_{2}) \frac{d}{d y} [{(x^{2} + y^{2})}^{\frac{1}{2}}] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.2.3

Replace all occurrences of $u_{2}$ with ${(x^{2} + y^{2})}^{\frac{1}{2}}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) \frac{d}{d y} [{(x^{2} + y^{2})}^{\frac{1}{2}}] + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.3

Differentiate using the chain rule, which states that $\frac{d}{d y} [f (g (y))]$ is $f' (g (y)) g' (y)$ where $f (y) = y^{\frac{1}{2}}$ and $g (y) = x^{2} + y^{2}$ .

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Step 3.3.1

To apply the Chain Rule, set $u_{3}$ as $x^{2} + y^{2}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{d}{d u_{3}} [{u_{3}}^{\frac{1}{2}}] \frac{d}{d y} [x^{2} + y^{2}]) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.3.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{3}} [{u_{3}}^{n}]$ is $n {u_{3}}^{n - 1}$ where $n = \frac{1}{2}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {u_{3}}^{\frac{1}{2} - 1} \frac{d}{d y} [x^{2} + y^{2}]) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.3.3

Replace all occurrences of $u_{3}$ with $x^{2} + y^{2}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{\frac{1}{2} - 1} \frac{d}{d y} [x^{2} + y^{2}]) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.4

By the Sum Rule, the derivative of $x^{2} + y^{2}$ with respect to $y$ is $\frac{d}{d y} [x^{2}] + \frac{d}{d y} [y^{2}]$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{\frac{1}{2} - 1} (\frac{d}{d y} [x^{2}] + \frac{d}{d y} [y^{2}])) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.5

Since $x^{2}$ is constant with respect to $y$ , the derivative of $x^{2}$ with respect to $y$ is $0$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{\frac{1}{2} - 1} (0 + \frac{d}{d y} [y^{2}])) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.6

Differentiate using the Power Rule which states that $\frac{d}{d y} [y^{n}]$ is $n y^{n - 1}$ where $n = 2$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{\frac{1}{2} - 1} (0 + 2 y)) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.7

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} (0 + 2 y)) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.8

Combine $- 1$ and $\frac{2}{2}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} (0 + 2 y)) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.9

Combine the numerators over the common denominator.

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{\frac{1 - 1 \cdot 2}{2}} (0 + 2 y)) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.10

Simplify the numerator.

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Step 3.10.1

Multiply $- 1$ by $2$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{\frac{1 - 2}{2}} (0 + 2 y)) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.10.2

Subtract $2$ from $1$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{\frac{- 1}{2}} (0 + 2 y)) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.11

Move the negative in front of the fraction.

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{- \frac{1}{2}} (0 + 2 y)) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.12

Add $0$ and $2 y$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{1}{2} {(x^{2} + y^{2})}^{- \frac{1}{2}} (2 y)) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.13

Combine $\frac{1}{2}$ and ${(x^{2} + y^{2})}^{- \frac{1}{2}}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{{(x^{2} + y^{2})}^{- \frac{1}{2}}}{2} (2 y)) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.14

Combine $2$ and $\frac{{(x^{2} + y^{2})}^{- \frac{1}{2}}}{2}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) (\frac{2 {(x^{2} + y^{2})}^{- \frac{1}{2}}}{2} y) + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.15

Combine $\frac{2 {(x^{2} + y^{2})}^{- \frac{1}{2}}}{2}$ and $y$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) \frac{2 {(x^{2} + y^{2})}^{- \frac{1}{2}} y}{2} + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.16

Move ${(x^{2} + y^{2})}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) \frac{2 y}{2 {(x^{2} + y^{2})}^{\frac{1}{2}}} + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.17

Cancel the common factor.

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) \frac{2 y}{2 {(x^{2} + y^{2})}^{\frac{1}{2}}} + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.18

Rewrite the expression.

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) \frac{y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 3.19

Combine $\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}})$ and $\frac{y}{{(x^{2} + y^{2})}^{\frac{1}{2}}}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + \frac{d}{d y} [\frac{x}{y^{2}}]$

Step 4

Evaluate $\frac{d}{d y} [\frac{x}{y^{2}}]$ .

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Step 4.1

Since $x$ is constant with respect to $y$ , the derivative of $\frac{x}{y^{2}}$ with respect to $y$ is $x \frac{d}{d y} [\frac{1}{y^{2}}]$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x \frac{d}{d y} [\frac{1}{y^{2}}]$

Step 4.2

Rewrite $\frac{1}{y^{2}}$ as ${(y^{2})}^{- 1}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x \frac{d}{d y} [{(y^{2})}^{- 1}]$

Step 4.3

Differentiate using the chain rule, which states that $\frac{d}{d y} [f (g (y))]$ is $f' (g (y)) g' (y)$ where $f (y) = y^{- 1}$ and $g (y) = y^{2}$ .

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Step 4.3.1

To apply the Chain Rule, set $u_{4}$ as $y^{2}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (\frac{d}{d u_{4}} [{u_{4}}^{- 1}] \frac{d}{d y} [y^{2}])$

Step 4.3.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{4}} [{u_{4}}^{n}]$ is $n {u_{4}}^{n - 1}$ where $n = - 1$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- {u_{4}}^{- 2} \frac{d}{d y} [y^{2}])$

Step 4.3.3

Replace all occurrences of $u_{4}$ with $y^{2}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- {(y^{2})}^{- 2} \frac{d}{d y} [y^{2}])$

Step 4.4

Differentiate using the Power Rule which states that $\frac{d}{d y} [y^{n}]$ is $n y^{n - 1}$ where $n = 2$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- {(y^{2})}^{- 2} (2 y))$

Step 4.5

Multiply the exponents in ${(y^{2})}^{- 2}$ .

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Step 4.5.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- y^{2 \cdot - 2} (2 y))$

Step 4.5.2

Multiply $2$ by $- 2$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- y^{- 4} (2 y))$

Step 4.6

Multiply $2$ by $- 1$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- 2 y^{- 4} y)$

Step 4.7

Raise $y$ to the power of $1$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- 2 (y^{1} y^{- 4}))$

Step 4.8

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- 2 y^{1 - 4})$

Step 4.9

Subtract $4$ from $1$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- 2 y^{- 3})$

Step 5

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- 2 \frac{1}{y^{3}})$

Step 6

Combine terms.

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Step 6.1

Combine $- 2$ and $\frac{1}{y^{3}}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x \frac{- 2}{y^{3}}$

Step 6.2

Move the negative in front of the fraction.

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + x (- \frac{2}{y^{3}})$

Step 6.3

Combine $x$ and $\frac{2}{y^{3}}$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} - \frac{x \cdot 2}{y^{3}}$

Step 6.4

Move $2$ to the left of $x$ .

$- \frac{6 y}{2 x^{2} - 3 y^{2}} + \frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} - \frac{2 \cdot x}{y^{3}}$

Step 6.5

To write $- \frac{6 y}{2 x^{2} - 3 y^{2}}$ as a fraction with a common denominator, multiply by $\frac{y^{3}}{y^{3}}$ .

$\frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} - \frac{6 y}{2 x^{2} - 3 y^{2}} \cdot \frac{y^{3}}{y^{3}} - \frac{2 x}{y^{3}}$

Step 6.6

To write $- \frac{2 x}{y^{3}}$ as a fraction with a common denominator, multiply by $\frac{2 x^{2} - 3 y^{2}}{2 x^{2} - 3 y^{2}}$ .

$\frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} - \frac{6 y}{2 x^{2} - 3 y^{2}} \cdot \frac{y^{3}}{y^{3}} - \frac{2 x}{y^{3}} \cdot \frac{2 x^{2} - 3 y^{2}}{2 x^{2} - 3 y^{2}}$

Step 6.7

Write each expression with a common denominator of $(2 x^{2} - 3 y^{2}) y^{3}$ , by multiplying each by an appropriate factor of $1$ .

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Step 6.7.1

Multiply $\frac{6 y}{2 x^{2} - 3 y^{2}}$ by $\frac{y^{3}}{y^{3}}$ .

$\frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} - \frac{6 y \cdot y^{3}}{(2 x^{2} - 3 y^{2}) y^{3}} - \frac{2 x}{y^{3}} \cdot \frac{2 x^{2} - 3 y^{2}}{2 x^{2} - 3 y^{2}}$

Step 6.7.2

Multiply $\frac{2 x}{y^{3}}$ by $\frac{2 x^{2} - 3 y^{2}}{2 x^{2} - 3 y^{2}}$ .

$\frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} - \frac{6 y \cdot y^{3}}{(2 x^{2} - 3 y^{2}) y^{3}} - \frac{2 x (2 x^{2} - 3 y^{2})}{y^{3} (2 x^{2} - 3 y^{2})}$

Step 6.7.3

Reorder the factors of $(2 x^{2} - 3 y^{2}) y^{3}$ .

$\frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} - \frac{6 y \cdot y^{3}}{y^{3} (2 x^{2} - 3 y^{2})} - \frac{2 x (2 x^{2} - 3 y^{2})}{y^{3} (2 x^{2} - 3 y^{2})}$

Step 6.8

Combine the numerators over the common denominator.

$\frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + \frac{- 6 y \cdot y^{3} - 2 x (2 x^{2} - 3 y^{2})}{y^{3} (2 x^{2} - 3 y^{2})}$

Step 6.9

Multiply $y$ by $y^{3}$ by adding the exponents.

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Step 6.9.1

Move $y^{3}$ .

$\frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + \frac{- 6 (y^{3} y) - 2 x (2 x^{2} - 3 y^{2})}{y^{3} (2 x^{2} - 3 y^{2})}$

Step 6.9.2

Multiply $y^{3}$ by $y$ .

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Step 6.9.2.1

Raise $y$ to the power of $1$ .

$\frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + \frac{- 6 (y^{3} y^{1}) - 2 x (2 x^{2} - 3 y^{2})}{y^{3} (2 x^{2} - 3 y^{2})}$

Step 6.9.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + \frac{- 6 y^{3 + 1} - 2 x (2 x^{2} - 3 y^{2})}{y^{3} (2 x^{2} - 3 y^{2})}$

Step 6.9.3

Add $3$ and $1$ .

$\frac{\sec^{2} ({(x^{2} + y^{2})}^{\frac{1}{2}}) y}{{(x^{2} + y^{2})}^{\frac{1}{2}}} + \frac{- 6 y^{4} - 2 x (2 x^{2} - 3 y^{2})}{y^{3} (2 x^{2} - 3 y^{2})}$