Calculus Examples

$e^{2 x} \sin (2 x) \cos (x)$

Step 1

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

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

Step 2

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

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

Step 3

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

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

Step 4

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

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Step 4.1

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

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

Step 4.2

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

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

Step 4.3

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

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

Step 5

Differentiate.

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Step 5.1

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

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

Step 5.2

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

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

Step 5.3

Simplify the expression.

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Step 5.3.1

Multiply $2$ by $1$ .

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

Step 5.3.2

Move $2$ to the left of $\cos (2 x)$ .

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

Step 6

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 $g (x) = 2 x$ .

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Step 6.1

To apply the Chain Rule, set $u_{2}$ as $2 x$ .

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

Step 6.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{2}} [a^{u_{2}}]$ is $a^{u_{2}} \ln (a)$ where $a$ = $e$ .

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

Step 6.3

Replace all occurrences of $u_{2}$ with $2 x$ .

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

Step 7

Differentiate.

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Step 7.1

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

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

Step 7.2

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

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

Step 7.3

Simplify the expression.

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Step 7.3.1

Multiply $2$ by $1$ .

$e^{2 x} \sin (2 x) (- \sin (x)) + \cos (x) (e^{2 x} (2 \cos (2 x)) + \sin (2 x) (e^{2 x} \cdot 2))$

Step 7.3.2

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

$e^{2 x} \sin (2 x) (- \sin (x)) + \cos (x) (e^{2 x} (2 \cos (2 x)) + \sin (2 x) (2 \cdot e^{2 x}))$

Step 8

Simplify.

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Step 8.1

Apply the distributive property.

$e^{2 x} \sin (2 x) (- \sin (x)) + \cos (x) (e^{2 x} (2 \cos (2 x))) + \cos (x) (\sin (2 x) (2 e^{2 x}))$

Step 8.2

Move $2$ to the left of $\cos (x) e^{2 x}$ .

$e^{2 x} \sin (2 x) (- \sin (x)) + 2 \cos (x) e^{2 x} \cos (2 x) + \cos (x) \sin (2 x) (2 e^{2 x})$

Step 8.3

Reorder terms.

$- e^{2 x} \sin (x) \sin (2 x) + 2 e^{2 x} \cos (x) \cos (2 x) + 2 e^{2 x} \cos (x) \sin (2 x)$