Calculus Examples

$- \frac{e^{- 2 x^{3}}}{4 x^{4}}$

Step 1

Since $- \frac{1}{4}$ is constant with respect to $x$ , the derivative of $- \frac{e^{- 2 x^{3}}}{4 x^{4}}$ with respect to $x$ is $- \frac{1}{4} \frac{d}{d x} [\frac{e^{- 2 x^{3}}}{x^{4}}]$ .

$- \frac{1}{4} \frac{d}{d x} [\frac{e^{- 2 x^{3}}}{x^{4}}]$

Step 2

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = e^{- 2 x^{3}}$ and $g (x) = x^{4}$ .

$- \frac{1}{4} \cdot \frac{x^{4} \frac{d}{d x} [e^{- 2 x^{3}}] - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{{(x^{4})}^{2}}$

Step 3

Multiply the exponents in ${(x^{4})}^{2}$ .

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Step 3.1

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

$- \frac{1}{4} \cdot \frac{x^{4} \frac{d}{d x} [e^{- 2 x^{3}}] - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{4 \cdot 2}}$

Step 3.2

Multiply $4$ by $2$ .

$- \frac{1}{4} \cdot \frac{x^{4} \frac{d}{d x} [e^{- 2 x^{3}}] - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 4

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

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Step 4.1

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

$- \frac{1}{4} \cdot \frac{x^{4} (\frac{d}{d u} [e^{u}] \frac{d}{d x} [- 2 x^{3}]) - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 4.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u} [a^{u}]$ is $a^{u} \ln (a)$ where $a$ = $e$ .

$- \frac{1}{4} \cdot \frac{x^{4} (e^{u} \frac{d}{d x} [- 2 x^{3}]) - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 4.3

Replace all occurrences of $u$ with $- 2 x^{3}$ .

$- \frac{1}{4} \cdot \frac{x^{4} (e^{- 2 x^{3}} \frac{d}{d x} [- 2 x^{3}]) - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 5

Differentiate.

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Step 5.1

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

$- \frac{1}{4} \cdot \frac{x^{4} (e^{- 2 x^{3}} (- 2 \frac{d}{d x} [x^{3}])) - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 5.2

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

$- \frac{1}{4} \cdot \frac{x^{4} (e^{- 2 x^{3}} (- 2 (3 x^{2}))) - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 5.3

Multiply $3$ by $- 2$ .

$- \frac{1}{4} \cdot \frac{x^{4} (e^{- 2 x^{3}} (- 6 x^{2})) - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 6

Multiply $x^{4}$ by $x^{2}$ by adding the exponents.

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Step 6.1

Move $x^{2}$ .

$- \frac{1}{4} \cdot \frac{x^{2} x^{4} (e^{- 2 x^{3}} \cdot (- 6)) - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 6.2

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

$- \frac{1}{4} \cdot \frac{x^{2 + 4} (e^{- 2 x^{3}} \cdot (- 6)) - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 6.3

Add $2$ and $4$ .

$- \frac{1}{4} \cdot \frac{x^{6} (e^{- 2 x^{3}} \cdot (- 6)) - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 7

Move $- 6$ to the left of $e^{- 2 x^{3}}$ .

$- \frac{1}{4} \cdot \frac{x^{6} (- 6 \cdot e^{- 2 x^{3}}) - e^{- 2 x^{3}} \frac{d}{d x} [x^{4}]}{x^{8}}$

Step 8

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

$- \frac{1}{4} \cdot \frac{x^{6} (- 6 e^{- 2 x^{3}}) - e^{- 2 x^{3}} (4 x^{3})}{x^{8}}$

Step 9

Combine fractions.

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Step 9.1

Multiply $4$ by $- 1$ .

$- \frac{1}{4} \cdot \frac{x^{6} (- 6 e^{- 2 x^{3}}) - 4 e^{- 2 x^{3}} x^{3}}{x^{8}}$

Step 9.2

Multiply $\frac{x^{6} (- 6 e^{- 2 x^{3}}) - 4 e^{- 2 x^{3}} x^{3}}{x^{8}}$ by $\frac{1}{4}$ .

$- \frac{x^{6} (- 6 e^{- 2 x^{3}}) - 4 e^{- 2 x^{3}} x^{3}}{x^{8} \cdot 4}$

Step 9.3

Move $4$ to the left of $x^{8}$ .

$- \frac{x^{6} (- 6 e^{- 2 x^{3}}) - 4 e^{- 2 x^{3}} x^{3}}{4 \cdot x^{8}}$

Step 10

Simplify.

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Step 10.1

Simplify the numerator.

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Step 10.1.1

Rewrite using the commutative property of multiplication.

$- \frac{- 6 x^{6} e^{- 2 x^{3}} - 4 e^{- 2 x^{3}} x^{3}}{4 x^{8}}$

Step 10.1.2

Reorder factors in $- 6 x^{6} e^{- 2 x^{3}} - 4 e^{- 2 x^{3}} x^{3}$ .

$- \frac{- 6 x^{6} e^{- 2 x^{3}} - 4 x^{3} e^{- 2 x^{3}}}{4 x^{8}}$

Step 10.2

Factor $2 x^{3} e^{- 2 x^{3}}$ out of $- 6 x^{6} e^{- 2 x^{3}} - 4 x^{3} e^{- 2 x^{3}}$ .

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Step 10.2.1

Factor $2 x^{3} e^{- 2 x^{3}}$ out of $- 6 x^{6} e^{- 2 x^{3}}$ .

$- \frac{2 x^{3} e^{- 2 x^{3}} (- 3 x^{3}) - 4 x^{3} e^{- 2 x^{3}}}{4 x^{8}}$

Step 10.2.2

Factor $2 x^{3} e^{- 2 x^{3}}$ out of $- 4 x^{3} e^{- 2 x^{3}}$ .

$- \frac{2 x^{3} e^{- 2 x^{3}} (- 3 x^{3}) + 2 x^{3} e^{- 2 x^{3}} (- 2)}{4 x^{8}}$

Step 10.2.3

Factor $2 x^{3} e^{- 2 x^{3}}$ out of $2 x^{3} e^{- 2 x^{3}} (- 3 x^{3}) + 2 x^{3} e^{- 2 x^{3}} (- 2)$ .

$- \frac{2 x^{3} e^{- 2 x^{3}} (- 3 x^{3} - 2)}{4 x^{8}}$

Step 10.3

Cancel the common factor of $2$ and $4$ .

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Step 10.3.1

Factor $2$ out of $2 x^{3} e^{- 2 x^{3}} (- 3 x^{3} - 2)$ .

$- \frac{2 (x^{3} e^{- 2 x^{3}} (- 3 x^{3} - 2))}{4 x^{8}}$

Step 10.3.2

Cancel the common factors.

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Step 10.3.2.1

Factor $2$ out of $4 x^{8}$ .

$- \frac{2 (x^{3} e^{- 2 x^{3}} (- 3 x^{3} - 2))}{2 (2 x^{8})}$

Step 10.3.2.2

Cancel the common factor.

$- \frac{2 (x^{3} e^{- 2 x^{3}} (- 3 x^{3} - 2))}{2 (2 x^{8})}$

Step 10.3.2.3

Rewrite the expression.

$- \frac{x^{3} e^{- 2 x^{3}} (- 3 x^{3} - 2)}{2 x^{8}}$

Step 10.4

Cancel the common factor of $x^{3}$ and $x^{8}$ .

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Step 10.4.1

Factor $x^{3}$ out of $x^{3} e^{- 2 x^{3}} (- 3 x^{3} - 2)$ .

$- \frac{x^{3} (e^{- 2 x^{3}} (- 3 x^{3} - 2))}{2 x^{8}}$

Step 10.4.2

Cancel the common factors.

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Step 10.4.2.1

Factor $x^{3}$ out of $2 x^{8}$ .

$- \frac{x^{3} (e^{- 2 x^{3}} (- 3 x^{3} - 2))}{x^{3} (2 x^{5})}$

Step 10.4.2.2

Cancel the common factor.

$- \frac{x^{3} (e^{- 2 x^{3}} (- 3 x^{3} - 2))}{x^{3} (2 x^{5})}$

Step 10.4.2.3

Rewrite the expression.

$- \frac{e^{- 2 x^{3}} (- 3 x^{3} - 2)}{2 x^{5}}$

Step 10.5

Factor $- 1$ out of $- 3 x^{3}$ .

$- \frac{e^{- 2 x^{3}} (- (3 x^{3}) - 2)}{2 x^{5}}$

Step 10.6

Rewrite $- 2$ as $- 1 (2)$ .

$- \frac{e^{- 2 x^{3}} (- (3 x^{3}) - 1 (2))}{2 x^{5}}$

Step 10.7

Factor $- 1$ out of $- (3 x^{3}) - 1 (2)$ .

$- \frac{e^{- 2 x^{3}} (- (3 x^{3} + 2))}{2 x^{5}}$

Step 10.8

Rewrite $- (3 x^{3} + 2)$ as $- 1 (3 x^{3} + 2)$ .

$- \frac{e^{- 2 x^{3}} (- 1 (3 x^{3} + 2))}{2 x^{5}}$

Step 10.9

Move the negative in front of the fraction.

$- - \frac{e^{- 2 x^{3}} (3 x^{3} + 2)}{2 x^{5}}$

Step 10.10

Multiply $- 1$ by $- 1$ .

$1 \frac{e^{- 2 x^{3}} (3 x^{3} + 2)}{2 x^{5}}$

Step 10.11

Multiply $\frac{e^{- 2 x^{3}} (3 x^{3} + 2)}{2 x^{5}}$ by $1$ .

$\frac{e^{- 2 x^{3}} (3 x^{3} + 2)}{2 x^{5}}$