Calculus Examples

$y = \sin (\sqrt{2 x})$

Step 1

Simplify with factoring out.

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Step 1.1

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

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

Step 1.2

Factor $2$ out of $2 x$ .

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

Step 1.3

Apply the product rule to $2 (x)$ .

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

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

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Step 2.1

To apply the Chain Rule, set $u$ as $2^{\frac{1}{2}} x^{\frac{1}{2}}$ .

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

Step 2.2

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

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

Step 2.3

Replace all occurrences of $u$ with $2^{\frac{1}{2}} x^{\frac{1}{2}}$ .

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

Step 3

Differentiate.

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Step 3.1

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

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

Step 3.2

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

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

Step 4

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

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

Step 5

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

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

Step 6

Combine the numerators over the common denominator.

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

Step 7

Simplify the numerator.

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Step 7.1

Multiply $- 1$ by $2$ .

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

Step 7.2

Subtract $2$ from $1$ .

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

Step 8

Move the negative in front of the fraction.

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

Step 9

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

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

Step 10

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

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

Step 11

Simplify the expression.

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Step 11.1

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

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

Step 11.2

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

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

Step 12

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

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Step 12.1

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

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Step 12.1.1

Raise $2$ to the power of $1$ .

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

Step 12.1.2

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

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

Step 12.2

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

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

Step 12.3

Combine the numerators over the common denominator.

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

Step 12.4

Subtract $1$ from $2$ .

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

Step 13

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

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