Calculus Examples

$y = (2 x^{5} + 3) \cos (x^{2})$

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 $f (x) = 2 x^{5} + 3$ and $g (x) = \cos (x^{2})$ .

$(2 x^{5} + 3) \frac{d}{d x} [\cos (x^{2})] + \cos (x^{2}) \frac{d}{d x} [2 x^{5} + 3]$

Step 2

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

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Step 2.1

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

$(2 x^{5} + 3) (\frac{d}{d u} [\cos (u)] \frac{d}{d x} [x^{2}]) + \cos (x^{2}) \frac{d}{d x} [2 x^{5} + 3]$

Step 2.2

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

$(2 x^{5} + 3) (- \sin (u) \frac{d}{d x} [x^{2}]) + \cos (x^{2}) \frac{d}{d x} [2 x^{5} + 3]$

Step 2.3

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

$(2 x^{5} + 3) (- \sin (x^{2}) \frac{d}{d x} [x^{2}]) + \cos (x^{2}) \frac{d}{d x} [2 x^{5} + 3]$

Step 3

Differentiate.

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Step 3.1

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

$(2 x^{5} + 3) (- \sin (x^{2}) (2 x)) + \cos (x^{2}) \frac{d}{d x} [2 x^{5} + 3]$

Step 3.2

Multiply $2$ by $- 1$ .

$(2 x^{5} + 3) (- 2 \sin (x^{2}) x) + \cos (x^{2}) \frac{d}{d x} [2 x^{5} + 3]$

Step 3.3

By the Sum Rule, the derivative of $2 x^{5} + 3$ with respect to $x$ is $\frac{d}{d x} [2 x^{5}] + \frac{d}{d x} [3]$ .

$(2 x^{5} + 3) (- 2 \sin (x^{2}) x) + \cos (x^{2}) (\frac{d}{d x} [2 x^{5}] + \frac{d}{d x} [3])$

Step 3.4

Since $2$ is constant with respect to $x$ , the derivative of $2 x^{5}$ with respect to $x$ is $2 \frac{d}{d x} [x^{5}]$ .

$(2 x^{5} + 3) (- 2 \sin (x^{2}) x) + \cos (x^{2}) (2 \frac{d}{d x} [x^{5}] + \frac{d}{d x} [3])$

Step 3.5

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 5$ .

$(2 x^{5} + 3) (- 2 \sin (x^{2}) x) + \cos (x^{2}) (2 (5 x^{4}) + \frac{d}{d x} [3])$

Step 3.6

Multiply $5$ by $2$ .

$(2 x^{5} + 3) (- 2 \sin (x^{2}) x) + \cos (x^{2}) (10 x^{4} + \frac{d}{d x} [3])$

Step 3.7

Since $3$ is constant with respect to $x$ , the derivative of $3$ with respect to $x$ is $0$ .

$(2 x^{5} + 3) (- 2 \sin (x^{2}) x) + \cos (x^{2}) (10 x^{4} + 0)$

Step 3.8

Add $10 x^{4}$ and $0$ .

$(2 x^{5} + 3) (- 2 \sin (x^{2}) x) + \cos (x^{2}) (10 x^{4})$

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

$2 x^{5} (- 2 \sin (x^{2}) x) + 3 (- 2 \sin (x^{2}) x) + \cos (x^{2}) (10 x^{4})$

Step 4.2

Combine terms.

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Step 4.2.1

Multiply $- 2$ by $2$ .

$- 4 x^{5} (\sin (x^{2}) x) + 3 (- 2 \sin (x^{2}) x) + \cos (x^{2}) (10 x^{4})$

Step 4.2.2

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

$- 4 (x^{1} x^{5}) \sin (x^{2}) + 3 (- 2 \sin (x^{2}) x) + \cos (x^{2}) (10 x^{4})$

Step 4.2.3

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

$- 4 x^{1 + 5} \sin (x^{2}) + 3 (- 2 \sin (x^{2}) x) + \cos (x^{2}) (10 x^{4})$

Step 4.2.4

Add $1$ and $5$ .

$- 4 x^{6} \sin (x^{2}) + 3 (- 2 \sin (x^{2}) x) + \cos (x^{2}) (10 x^{4})$

Step 4.2.5

Multiply $- 2$ by $3$ .

$- 4 x^{6} \sin (x^{2}) - 6 \sin (x^{2}) x + \cos (x^{2}) (10 x^{4})$

Step 4.3

Reorder terms.

$- 4 x^{6} \sin (x^{2}) - 6 x \sin (x^{2}) + 10 x^{4} \cos (x^{2})$