Calculus Examples

$(x + y^{2}) \sqrt{e^{x}} + \frac{2}{e}$

Step 1

By the Sum Rule, the derivative of $(x + y^{2}) \sqrt{e^{x}} + \frac{2}{e}$ with respect to $x$ is $\frac{d}{d x} [(x + y^{2}) \sqrt{e^{x}}] + \frac{d}{d x} [\frac{2}{e}]$ .

$\frac{d}{d x} [(x + y^{2}) \sqrt{e^{x}}] + \frac{d}{d x} [\frac{2}{e}]$

Step 2

Evaluate $\frac{d}{d x} [(x + y^{2}) \sqrt{e^{x}}]$ .

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Step 2.1

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

$\frac{d}{d x} [(x + y^{2}) e^{\frac{x}{2}}] + \frac{d}{d x} [\frac{2}{e}]$

Step 2.2

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

$(x + y^{2}) \frac{d}{d x} [e^{\frac{x}{2}}] + e^{\frac{x}{2}} \frac{d}{d x} [x + y^{2}] + \frac{d}{d x} [\frac{2}{e}]$

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 $f (x) = e^{x}$ and $g (x) = \frac{x}{2}$ .

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Step 2.3.1

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

$(x + y^{2}) (\frac{d}{d u} [e^{u}] \frac{d}{d x} [\frac{x}{2}]) + e^{\frac{x}{2}} \frac{d}{d x} [x + y^{2}] + \frac{d}{d x} [\frac{2}{e}]$

Step 2.3.2

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

$(x + y^{2}) (e^{u} \frac{d}{d x} [\frac{x}{2}]) + e^{\frac{x}{2}} \frac{d}{d x} [x + y^{2}] + \frac{d}{d x} [\frac{2}{e}]$

Step 2.3.3

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

$(x + y^{2}) (e^{\frac{x}{2}} \frac{d}{d x} [\frac{x}{2}]) + e^{\frac{x}{2}} \frac{d}{d x} [x + y^{2}] + \frac{d}{d x} [\frac{2}{e}]$

Step 2.4

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

$(x + y^{2}) (e^{\frac{x}{2}} (\frac{1}{2} \frac{d}{d x} [x])) + e^{\frac{x}{2}} \frac{d}{d x} [x + y^{2}] + \frac{d}{d x} [\frac{2}{e}]$

Step 2.5

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

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

Step 2.6

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

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

Step 2.7

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

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

Step 2.8

Since $y^{2}$ is constant with respect to $x$ , the derivative of $y^{2}$ with respect to $x$ is $0$ .

$(x + y^{2}) (e^{\frac{x}{2}} (\frac{1}{2} \cdot 1)) + e^{\frac{x}{2}} (1 + 0) + \frac{d}{d x} [\frac{2}{e}]$

Step 2.9

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

$(x + y^{2}) (e^{\frac{x}{2}} \frac{1}{2}) + e^{\frac{x}{2}} (1 + 0) + \frac{d}{d x} [\frac{2}{e}]$

Step 2.10

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

$(x + y^{2}) \frac{e^{\frac{x}{2}}}{2} + e^{\frac{x}{2}} (1 + 0) + \frac{d}{d x} [\frac{2}{e}]$

Step 2.11

Add $1$ and $0$ .

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

Step 2.12

Multiply $e^{\frac{x}{2}}$ by $1$ .

$(x + y^{2}) \frac{e^{\frac{x}{2}}}{2} + e^{\frac{x}{2}} + \frac{d}{d x} [\frac{2}{e}]$

Step 3

Since $\frac{2}{e}$ is constant with respect to $x$ , the derivative of $\frac{2}{e}$ with respect to $x$ is $0$ .

$(x + y^{2}) \frac{e^{\frac{x}{2}}}{2} + e^{\frac{x}{2}} + 0$

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

$x \frac{e^{\frac{x}{2}}}{2} + y^{2} \frac{e^{\frac{x}{2}}}{2} + e^{\frac{x}{2}} + 0$

Step 4.2

Combine terms.

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Step 4.2.1

Combine $x$ and $\frac{e^{\frac{x}{2}}}{2}$ .

$\frac{x e^{\frac{x}{2}}}{2} + y^{2} \frac{e^{\frac{x}{2}}}{2} + e^{\frac{x}{2}} + 0$

Step 4.2.2

Combine $y^{2}$ and $\frac{e^{\frac{x}{2}}}{2}$ .

$\frac{x e^{\frac{x}{2}}}{2} + \frac{y^{2} e^{\frac{x}{2}}}{2} + e^{\frac{x}{2}} + 0$

Step 4.2.3

Add $\frac{x e^{\frac{x}{2}}}{2} + \frac{y^{2} e^{\frac{x}{2}}}{2} + e^{\frac{x}{2}}$ and $0$ .

$\frac{x e^{\frac{x}{2}}}{2} + \frac{y^{2} e^{\frac{x}{2}}}{2} + e^{\frac{x}{2}}$

Step 4.3

Reorder terms.

$\frac{y^{2} e^{\frac{x}{2}}}{2} + \frac{x e^{\frac{x}{2}}}{2} + e^{\frac{x}{2}}$