Calculus Examples

$f (x) = \sin (\sqrt{\cos (\sqrt{1 - x^{2}})})$

Step 1

Apply basic rules of exponents.

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Step 1.1

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

$\frac{d}{d x} [\sin (\sqrt{\cos ({(1 - x^{2})}^{\frac{1}{2}})})]$

Step 1.2

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

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

Step 2

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

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Step 2.1

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

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

Step 2.2

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

$\cos (u_{1}) \frac{d}{d x} [{\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}]$

Step 2.3

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

$\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \frac{d}{d x} [{\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}]$

Step 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 $g (x) = \cos ({(1 - x^{2})}^{\frac{1}{2}})$ .

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Step 3.1

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

$\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) (\frac{d}{d u_{2}} [{u_{2}}^{\frac{1}{2}}] \frac{d}{d x} [\cos ({(1 - x^{2})}^{\frac{1}{2}})])$

Step 3.2

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

$\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) (\frac{1}{2} {u_{2}}^{\frac{1}{2} - 1} \frac{d}{d x} [\cos ({(1 - x^{2})}^{\frac{1}{2}})])$

Step 3.3

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

$\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) (\frac{1}{2} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2} - 1} \frac{d}{d x} [\cos ({(1 - x^{2})}^{\frac{1}{2}})])$

Step 4

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

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

Step 5

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

$\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) (\frac{1}{2} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} [\cos ({(1 - x^{2})}^{\frac{1}{2}})])$

Step 6

Combine the numerators over the common denominator.

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

Step 7

Simplify the numerator.

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Step 7.1

Multiply $- 1$ by $2$ .

$\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) (\frac{1}{2} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1 - 2}{2}} \frac{d}{d x} [\cos ({(1 - x^{2})}^{\frac{1}{2}})])$

Step 7.2

Subtract $2$ from $1$ .

$\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) (\frac{1}{2} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{- 1}{2}} \frac{d}{d x} [\cos ({(1 - x^{2})}^{\frac{1}{2}})])$

Step 8

Combine fractions.

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Step 8.1

Move the negative in front of the fraction.

$\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) (\frac{1}{2} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{- \frac{1}{2}} \frac{d}{d x} [\cos ({(1 - x^{2})}^{\frac{1}{2}})])$

Step 8.2

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

$\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) (\frac{{\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{- \frac{1}{2}}}{2} \frac{d}{d x} [\cos ({(1 - x^{2})}^{\frac{1}{2}})])$

Step 8.3

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

$\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) (\frac{1}{2 {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} \frac{d}{d x} [\cos ({(1 - x^{2})}^{\frac{1}{2}})])$

Step 8.4

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

$\frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}})}{2 {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} \frac{d}{d x} [\cos ({(1 - x^{2})}^{\frac{1}{2}})]$

Step 9

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

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Step 9.1

To apply the Chain Rule, set $u_{3}$ as ${(1 - x^{2})}^{\frac{1}{2}}$ .

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

Step 9.2

The derivative of $\cos (u_{3})$ with respect to $u_{3}$ is $- \sin (u_{3})$ .

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

Step 9.3

Replace all occurrences of $u_{3}$ with ${(1 - x^{2})}^{\frac{1}{2}}$ .

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

Step 10

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

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

Step 11

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 $g (x) = 1 - x^{2}$ .

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Step 11.1

To apply the Chain Rule, set $u_{4}$ as $1 - x^{2}$ .

$- \frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{2 {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} (\frac{d}{d u_{4}} [{u_{4}}^{\frac{1}{2}}] \frac{d}{d x} [1 - x^{2}])$

Step 11.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{4}} [{u_{4}}^{n}]$ is $n {u_{4}}^{n - 1}$ where $n = \frac{1}{2}$ .

$- \frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{2 {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} (\frac{1}{2} {u_{4}}^{\frac{1}{2} - 1} \frac{d}{d x} [1 - x^{2}])$

Step 11.3

Replace all occurrences of $u_{4}$ with $1 - x^{2}$ .

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

Step 12

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

$- \frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{2 {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} (\frac{1}{2} {(1 - x^{2})}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d x} [1 - x^{2}])$

Step 13

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

$- \frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{2 {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} (\frac{1}{2} {(1 - x^{2})}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} [1 - x^{2}])$

Step 14

Combine the numerators over the common denominator.

$- \frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{2 {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} (\frac{1}{2} {(1 - x^{2})}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d x} [1 - x^{2}])$

Step 15

Simplify the numerator.

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Step 15.1

Multiply $- 1$ by $2$ .

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

Step 15.2

Subtract $2$ from $1$ .

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

Step 16

Combine fractions.

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Step 16.1

Move the negative in front of the fraction.

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

Step 16.2

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

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

Step 16.3

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

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

Step 16.4

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

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

Step 16.5

Multiply $2$ by $2$ .

$- \frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} \frac{d}{d x} [1 - x^{2}]$

Step 17

By the Sum Rule, the derivative of $1 - x^{2}$ with respect to $x$ is $\frac{d}{d x} [1] + \frac{d}{d x} [- x^{2}]$ .

Step 18

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

Step 19

Add $0$ and $\frac{d}{d x} [- x^{2}]$ .

Step 20

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

Step 21

Multiply.

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Step 21.1

Multiply $- 1$ by $- 1$ .

$1 \frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} \frac{d}{d x} [x^{2}]$

Step 21.2

Multiply $\frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}}$ by $1$ .

$\frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} \frac{d}{d x} [x^{2}]$

Step 22

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

$\frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} (2 x)$

Step 23

Simplify terms.

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Step 23.1

Combine $2$ and $\frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}}$ .

$\frac{2 (\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}}))}{4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}} x$

Step 23.2

Combine $\frac{2 (\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}}))}{4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}}$ and $x$ .

$\frac{2 (\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})) x}{4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}}$

Step 23.3

Factor $2$ out of $2 \cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}}) x$ .

$\frac{2 (\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}}) x)}{4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}}$

Step 24

Cancel the common factors.

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Step 24.1

Factor $2$ out of $4 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}$ .

$\frac{2 (\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}}) x)}{2 (2 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}})}$

Step 24.2

Cancel the common factor.

$\frac{2 (\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}}) x)}{2 (2 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}})}$

Step 24.3

Rewrite the expression.

$\frac{\cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}}) x}{2 {(1 - x^{2})}^{\frac{1}{2}} {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}}$

Step 25

Reorder terms.

$\frac{x \cos ({\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}}) \sin ({(1 - x^{2})}^{\frac{1}{2}})}{2 {\cos ({(1 - x^{2})}^{\frac{1}{2}})}^{\frac{1}{2}} {(1 - x^{2})}^{\frac{1}{2}}}$