Calculus Examples

$q (x) = 8 (\sqrt{\frac{5 (\sin (x))}{3}}) - \frac{\sqrt[3]{5 \cos (x)}}{7}$

Step 1

By the Sum Rule, the derivative of $8 (\sqrt{\frac{5 (\sin (x))}{3}}) - \frac{\sqrt[3]{5 \cos (x)}}{7}$ with respect to $x$ is $\frac{d}{d x} [8 (\sqrt{\frac{5 (\sin (x))}{3}})] + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$ .

$\frac{d}{d x} [8 (\sqrt{\frac{5 (\sin (x))}{3}})] + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2

Evaluate $\frac{d}{d x} [8 (\sqrt{\frac{5 (\sin (x))}{3}})]$ .

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Step 2.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{\frac{5 \sin (x)}{3}}$ as ${(\frac{5 \sin (x)}{3})}^{\frac{1}{2}}$ .

$\frac{d}{d x} [8 {(\frac{5 \sin (x)}{3})}^{\frac{1}{2}}] + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.2

Since $8$ is constant with respect to $x$ , the derivative of $8 {(\frac{5 \sin (x)}{3})}^{\frac{1}{2}}$ with respect to $x$ is $8 \frac{d}{d x} [{(\frac{5 \sin (x)}{3})}^{\frac{1}{2}}]$ .

$8 \frac{d}{d x} [{(\frac{5 \sin (x)}{3})}^{\frac{1}{2}}] + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{2}}$ and $g (x) = \frac{5 \sin (x)}{3}$ .

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Step 2.3.1

To apply the Chain Rule, set $u_{1}$ as $\frac{5 \sin (x)}{3}$ .

$8 (\frac{d}{d u_{1}} [{u_{1}}^{\frac{1}{2}}] \frac{d}{d x} [\frac{5 \sin (x)}{3}]) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.3.2

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

$8 (\frac{1}{2} {(\frac{5 \sin (x)}{3})}^{\frac{1}{2} - 1} \frac{d}{d x} [\frac{5 \sin (x)}{3}]) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.4

Since $\frac{5}{3}$ is constant with respect to $x$ , the derivative of $\frac{5 \sin (x)}{3}$ with respect to $x$ is $\frac{5}{3} \frac{d}{d x} [\sin (x)]$ .

$8 (\frac{1}{2} {(\frac{5 \sin (x)}{3})}^{\frac{1}{2} - 1} (\frac{5}{3} \frac{d}{d x} [\sin (x)])) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.5

The derivative of $\sin (x)$ with respect to $x$ is $\cos (x)$ .

$8 (\frac{1}{2} {(\frac{5 \sin (x)}{3})}^{\frac{1}{2} - 1} (\frac{5}{3} \cos (x))) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.6

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

$8 (\frac{1}{2} {(\frac{5 \sin (x)}{3})}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} (\frac{5}{3} \cos (x))) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.7

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

$8 (\frac{1}{2} {(\frac{5 \sin (x)}{3})}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} (\frac{5}{3} \cos (x))) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.8

Combine the numerators over the common denominator.

$8 (\frac{1}{2} {(\frac{5 \sin (x)}{3})}^{\frac{1 - 1 \cdot 2}{2}} (\frac{5}{3} \cos (x))) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.9

Simplify the numerator.

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Step 2.9.1

Multiply $- 1$ by $2$ .

$8 (\frac{1}{2} {(\frac{5 \sin (x)}{3})}^{\frac{1 - 2}{2}} (\frac{5}{3} \cos (x))) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.9.2

Subtract $2$ from $1$ .

$8 (\frac{1}{2} {(\frac{5 \sin (x)}{3})}^{\frac{- 1}{2}} (\frac{5}{3} \cos (x))) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.10

Move the negative in front of the fraction.

$8 (\frac{1}{2} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} (\frac{5}{3} \cos (x))) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.11

Combine $\frac{5}{3}$ and $\cos (x)$ .

$8 (\frac{1}{2} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} \frac{5 \cos (x)}{3}) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.12

Multiply $\frac{5 \cos (x)}{3}$ by $\frac{1}{2}$ .

$8 (\frac{5 \cos (x)}{3 \cdot 2} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}}) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.13

Multiply $3$ by $2$ .

$8 (\frac{5 \cos (x)}{6} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}}) + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.14

Combine $\frac{5 \cos (x)}{6}$ and $8$ .

$\frac{5 \cos (x) \cdot 8}{6} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.15

Multiply $8$ by $5$ .

$\frac{40 \cos (x)}{6} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.16

Cancel the common factor of $40$ and $6$ .

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Step 2.16.1

Factor $2$ out of $40 \cos (x)$ .

$\frac{2 (20 \cos (x))}{6} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.16.2

Cancel the common factors.

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Step 2.16.2.1

Factor $2$ out of $6$ .

$\frac{2 (20 \cos (x))}{2 (3)} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.16.2.2

Cancel the common factor.

$\frac{2 (20 \cos (x))}{2 \cdot 3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 2.16.2.3

Rewrite the expression.

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$

Step 3

Evaluate $\frac{d}{d x} [- \frac{\sqrt[3]{5 \cos (x)}}{7}]$ .

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Step 3.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{5 \cos (x)}$ as ${(5 \cos (x))}^{\frac{1}{3}}$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{d}{d x} [- \frac{{(5 \cos (x))}^{\frac{1}{3}}}{7}]$

Step 3.2

Factor $5$ out of $5 \cos (x)$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{d}{d x} [- \frac{{(5 (\cos (x)))}^{\frac{1}{3}}}{7}]$

Step 3.3

Apply the product rule to $5 (\cos (x))$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{d}{d x} [- \frac{5^{\frac{1}{3}} {\cos (x)}^{\frac{1}{3}}}{7}]$

Step 3.4

Since $- \frac{5^{\frac{1}{3}}}{7}$ is constant with respect to $x$ , the derivative of $- \frac{5^{\frac{1}{3}} {\cos (x)}^{\frac{1}{3}}}{7}$ with respect to $x$ is $- \frac{5^{\frac{1}{3}}}{7} \frac{d}{d x} [{\cos (x)}^{\frac{1}{3}}]$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} \frac{d}{d x} [{\cos (x)}^{\frac{1}{3}}]$

Step 3.5

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{3}}$ and $g (x) = \cos (x)$ .

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Step 3.5.1

To apply the Chain Rule, set $u_{2}$ as $\cos (x)$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{d}{d u_{2}} [{u_{2}}^{\frac{1}{3}}] \frac{d}{d x} [\cos (x)])$

Step 3.5.2

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

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{1}{3} {u_{2}}^{\frac{1}{3} - 1} \frac{d}{d x} [\cos (x)])$

Step 3.5.3

Replace all occurrences of $u_{2}$ with $\cos (x)$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{1}{3} {\cos (x)}^{\frac{1}{3} - 1} \frac{d}{d x} [\cos (x)])$

Step 3.6

The derivative of $\cos (x)$ with respect to $x$ is $- \sin (x)$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{1}{3} {\cos (x)}^{\frac{1}{3} - 1} (- \sin (x)))$

Step 3.7

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{1}{3} {\cos (x)}^{\frac{1}{3} - 1 \cdot \frac{3}{3}} (- \sin (x)))$

Step 3.8

Combine $- 1$ and $\frac{3}{3}$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{1}{3} {\cos (x)}^{\frac{1}{3} + \frac{- 1 \cdot 3}{3}} (- \sin (x)))$

Step 3.9

Combine the numerators over the common denominator.

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{1}{3} {\cos (x)}^{\frac{1 - 1 \cdot 3}{3}} (- \sin (x)))$

Step 3.10

Simplify the numerator.

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Step 3.10.1

Multiply $- 1$ by $3$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{1}{3} {\cos (x)}^{\frac{1 - 3}{3}} (- \sin (x)))$

Step 3.10.2

Subtract $3$ from $1$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{1}{3} {\cos (x)}^{\frac{- 2}{3}} (- \sin (x)))$

Step 3.11

Move the negative in front of the fraction.

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{1}{3} {\cos (x)}^{- \frac{2}{3}} (- \sin (x)))$

Step 3.12

Combine $\frac{1}{3}$ and ${\cos (x)}^{- \frac{2}{3}}$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (\frac{{\cos (x)}^{- \frac{2}{3}}}{3} (- \sin (x)))$

Step 3.13

Combine $\frac{{\cos (x)}^{- \frac{2}{3}}}{3}$ and $\sin (x)$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (- \frac{{\cos (x)}^{- \frac{2}{3}} \sin (x)}{3})$

Step 3.14

Move ${\cos (x)}^{- \frac{2}{3}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} - \frac{5^{\frac{1}{3}}}{7} (- \frac{\sin (x)}{3 {\cos (x)}^{\frac{2}{3}}})$

Step 3.15

Multiply $- 1$ by $- 1$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + 1 \frac{5^{\frac{1}{3}}}{7} \frac{\sin (x)}{3 {\cos (x)}^{\frac{2}{3}}}$

Step 3.16

Multiply $\frac{5^{\frac{1}{3}}}{7}$ by $1$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{5^{\frac{1}{3}}}{7} \cdot \frac{\sin (x)}{3 {\cos (x)}^{\frac{2}{3}}}$

Step 3.17

Multiply $\frac{5^{\frac{1}{3}}}{7}$ by $\frac{\sin (x)}{3 {\cos (x)}^{\frac{2}{3}}}$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{5^{\frac{1}{3}} \sin (x)}{7 (3 {\cos (x)}^{\frac{2}{3}})}$

Step 3.18

Multiply $3$ by $7$ .

$\frac{20 \cos (x)}{3} {(\frac{5 \sin (x)}{3})}^{- \frac{1}{2}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 4

Change the sign of the exponent by rewriting the base as its reciprocal.

$\frac{20 \cos (x)}{3} {(\frac{3}{5 \sin (x)})}^{\frac{1}{2}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 5

Simplify.

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Step 5.1

Apply the product rule to $\frac{3}{5 \sin (x)}$ .

$\frac{20 \cos (x)}{3} \cdot \frac{3^{\frac{1}{2}}}{{(5 \sin (x))}^{\frac{1}{2}}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 5.2

Apply the product rule to $5 \sin (x)$ .

$\frac{20 \cos (x)}{3} \cdot \frac{3^{\frac{1}{2}}}{5^{\frac{1}{2}} {\sin (x)}^{\frac{1}{2}}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 5.3

Combine terms.

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Step 5.3.1

Multiply $\frac{20 \cos (x)}{3}$ by $\frac{3^{\frac{1}{2}}}{5^{\frac{1}{2}} {\sin (x)}^{\frac{1}{2}}}$ .

$\frac{20 \cos (x) \cdot 3^{\frac{1}{2}}}{3 (5^{\frac{1}{2}} {\sin (x)}^{\frac{1}{2}})} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 5.3.2

Move $3^{\frac{1}{2}}$ to the denominator using the negative exponent rule $b^{n} = \frac{1}{b^{- n}}$ .

$\frac{20 \cos (x)}{3 \cdot 5^{\frac{1}{2}} {\sin (x)}^{\frac{1}{2}} \cdot 3^{- \frac{1}{2}}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 5.3.3

Multiply $3$ by $3^{- \frac{1}{2}}$ by adding the exponents.

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Step 5.3.3.1

Move $3^{- \frac{1}{2}}$ .

$\frac{20 \cos (x)}{3^{- \frac{1}{2}} \cdot 3 \cdot 5^{\frac{1}{2}} {\sin (x)}^{\frac{1}{2}}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 5.3.3.2

Multiply $3^{- \frac{1}{2}}$ by $3$ .

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Step 5.3.3.2.1

Raise $3$ to the power of $1$ .

$\frac{20 \cos (x)}{3^{- \frac{1}{2}} \cdot 3^{1} \cdot 5^{\frac{1}{2}} {\sin (x)}^{\frac{1}{2}}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 5.3.3.2.2

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

$\frac{20 \cos (x)}{3^{- \frac{1}{2} + 1} \cdot 5^{\frac{1}{2}} {\sin (x)}^{\frac{1}{2}}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 5.3.3.3

Write $1$ as a fraction with a common denominator.

$\frac{20 \cos (x)}{3^{- \frac{1}{2} + \frac{2}{2}} \cdot 5^{\frac{1}{2}} {\sin (x)}^{\frac{1}{2}}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 5.3.3.4

Combine the numerators over the common denominator.

$\frac{20 \cos (x)}{3^{\frac{- 1 + 2}{2}} \cdot 5^{\frac{1}{2}} {\sin (x)}^{\frac{1}{2}}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$

Step 5.3.3.5

Add $- 1$ and $2$ .

$\frac{20 \cos (x)}{3^{\frac{1}{2}} \cdot 5^{\frac{1}{2}} {\sin (x)}^{\frac{1}{2}}} + \frac{5^{\frac{1}{3}} \sin (x)}{21 {\cos (x)}^{\frac{2}{3}}}$