Calculus Examples

$f (v) = 9 \sqrt{v (1 - e^{v})}$

Step 1

Differentiate using the Constant Multiple Rule.

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Step 1.1

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

$\frac{d}{d v} [9 {v (1 - e^{v})}^{\frac{1}{2}}]$

Step 1.2

Since $9$ is constant with respect to $v$ , the derivative of $9 {v (1 - e^{v})}^{\frac{1}{2}}$ with respect to $v$ is $9 \frac{d}{d v} [{v (1 - e^{v})}^{\frac{1}{2}}]$ .

$9 \frac{d}{d v} [{v (1 - e^{v})}^{\frac{1}{2}}]$

Step 2

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

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Step 2.1

To apply the Chain Rule, set $u$ as $v (1 - e^{v})$ .

$9 (\frac{d}{d u} [u^{\frac{1}{2}}] \frac{d}{d v} [v (1 - e^{v})])$

Step 2.2

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

$9 (\frac{1}{2} u^{\frac{1}{2} - 1} \frac{d}{d v} [v (1 - e^{v})])$

Step 2.3

Replace all occurrences of $u$ with $v (1 - e^{v})$ .

$9 (\frac{1}{2} {v (1 - e^{v})}^{\frac{1}{2} - 1} \frac{d}{d v} [v (1 - e^{v})])$

Step 3

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

$9 (\frac{1}{2} {v (1 - e^{v})}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d v} [v (1 - e^{v})])$

Step 4

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

$9 (\frac{1}{2} {v (1 - e^{v})}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d v} [v (1 - e^{v})])$

Step 5

Combine the numerators over the common denominator.

$9 (\frac{1}{2} {v (1 - e^{v})}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d v} [v (1 - e^{v})])$

Step 6

Simplify the numerator.

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Step 6.1

Multiply $- 1$ by $2$ .

$9 (\frac{1}{2} {v (1 - e^{v})}^{\frac{1 - 2}{2}} \frac{d}{d v} [v (1 - e^{v})])$

Step 6.2

Subtract $2$ from $1$ .

$9 (\frac{1}{2} {v (1 - e^{v})}^{\frac{- 1}{2}} \frac{d}{d v} [v (1 - e^{v})])$

Step 7

Move the negative in front of the fraction.

$9 (\frac{1}{2} {v (1 - e^{v})}^{- \frac{1}{2}} \frac{d}{d v} [v (1 - e^{v})])$

Step 8

Combine $\frac{1}{2}$ and ${v (1 - e^{v})}^{- \frac{1}{2}}$ .

$9 (\frac{{v (1 - e^{v})}^{- \frac{1}{2}}}{2} \frac{d}{d v} [v (1 - e^{v})])$

Step 9

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

$9 (\frac{1}{2 {v (1 - e^{v})}^{\frac{1}{2}}} \frac{d}{d v} [v (1 - e^{v})])$

Step 10

Combine $\frac{1}{2 {v (1 - e^{v})}^{\frac{1}{2}}}$ and $9$ .

$\frac{9}{2 {v (1 - e^{v})}^{\frac{1}{2}}} \frac{d}{d v} [v (1 - e^{v})]$

Step 11

Combine $\frac{9}{2 {v (1 - e^{v})}^{\frac{1}{2}}}$ and $\frac{d}{d v} [v (1 - e^{v})]$ .

$\frac{9 \frac{d}{d v} [v (1 - e^{v})]}{2 {v (1 - e^{v})}^{\frac{1}{2}}}$