Calculus Examples

$4 \tan (5 x) \sec (5 x)$

Step 1

Since $4$ is constant with respect to $x$ , the derivative of $4 \tan (5 x) \sec (5 x)$ with respect to $x$ is $4 \frac{d}{d x} [\tan (5 x) \sec (5 x)]$ .

$4 \frac{d}{d x} [\tan (5 x) \sec (5 x)]$

Step 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 $f (x) = \tan (5 x)$ and $g (x) = \sec (5 x)$ .

$4 (\tan (5 x) \frac{d}{d x} [\sec (5 x)] + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \sec (x)$ and $g (x) = 5 x$ .

Tap for more steps...

Step 3.1

To apply the Chain Rule, set $u_{1}$ as $5 x$ .

$4 (\tan (5 x) (\frac{d}{d u_{1}} [\sec (u_{1})] \frac{d}{d x} [5 x]) + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 3.2

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

$4 (\tan (5 x) (\sec (u_{1}) \tan (u_{1}) \frac{d}{d x} [5 x]) + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 3.3

Replace all occurrences of $u_{1}$ with $5 x$ .

$4 (\tan (5 x) (\sec (5 x) \tan (5 x) \frac{d}{d x} [5 x]) + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 4

Raise $\tan (5 x)$ to the power of $1$ .

$4 (\tan^{1} (5 x) \tan (5 x) (\sec (5 x) \frac{d}{d x} [5 x]) + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 5

Raise $\tan (5 x)$ to the power of $1$ .

$4 (\tan^{1} (5 x) \tan^{1} (5 x) (\sec (5 x) \frac{d}{d x} [5 x]) + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 6

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

$4 ({\tan (5 x)}^{1 + 1} (\sec (5 x) \frac{d}{d x} [5 x]) + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 7

Differentiate.

Tap for more steps...

Step 7.1

Add $1$ and $1$ .

$4 (\tan^{2} (5 x) (\sec (5 x) \frac{d}{d x} [5 x]) + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 7.2

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

$4 (\tan^{2} (5 x) \sec (5 x) (5 \frac{d}{d x} [x]) + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 7.3

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

$4 (\tan^{2} (5 x) \sec (5 x) (5 \cdot 1) + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 7.4

Simplify the expression.

Tap for more steps...

Step 7.4.1

Multiply $5$ by $1$ .

$4 (\tan^{2} (5 x) \sec (5 x) \cdot 5 + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 7.4.2

Move $5$ to the left of $\tan^{2} (5 x) \sec (5 x)$ .

$4 (5 \cdot (\tan^{2} (5 x) \sec (5 x)) + \sec (5 x) \frac{d}{d x} [\tan (5 x)])$

Step 8

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \tan (x)$ and $g (x) = 5 x$ .

Tap for more steps...

Step 8.1

To apply the Chain Rule, set $u_{2}$ as $5 x$ .

$4 (5 \tan^{2} (5 x) \sec (5 x) + \sec (5 x) (\frac{d}{d u_{2}} [\tan (u_{2})] \frac{d}{d x} [5 x]))$

Step 8.2

The derivative of $\tan (u_{2})$ with respect to $u_{2}$ is $\sec^{2} (u_{2})$ .

$4 (5 \tan^{2} (5 x) \sec (5 x) + \sec (5 x) (\sec^{2} (u_{2}) \frac{d}{d x} [5 x]))$

Step 8.3

Replace all occurrences of $u_{2}$ with $5 x$ .

$4 (5 \tan^{2} (5 x) \sec (5 x) + \sec (5 x) (\sec^{2} (5 x) \frac{d}{d x} [5 x]))$

Step 9

Raise $\sec (5 x)$ to the power of $1$ .

$4 (5 \tan^{2} (5 x) \sec (5 x) + \sec^{2} (5 x) \sec^{1} (5 x) \frac{d}{d x} [5 x])$

Step 10

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

$4 (5 \tan^{2} (5 x) \sec (5 x) + {\sec (5 x)}^{2 + 1} \frac{d}{d x} [5 x])$

Step 11

Add $2$ and $1$ .

$4 (5 \tan^{2} (5 x) \sec (5 x) + \sec^{3} (5 x) \frac{d}{d x} [5 x])$

Step 12

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

$4 (5 \tan^{2} (5 x) \sec (5 x) + \sec^{3} (5 x) (5 \frac{d}{d x} [x]))$

Step 13

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

$4 (5 \tan^{2} (5 x) \sec (5 x) + \sec^{3} (5 x) (5 \cdot 1))$

Step 14

Simplify the expression.

Tap for more steps...

Step 14.1

Multiply $5$ by $1$ .

$4 (5 \tan^{2} (5 x) \sec (5 x) + \sec^{3} (5 x) \cdot 5)$

Step 14.2

Move $5$ to the left of $\sec^{3} (5 x)$ .

$4 (5 \tan^{2} (5 x) \sec (5 x) + 5 \cdot \sec^{3} (5 x))$

Step 15

Simplify.

Tap for more steps...

Step 15.1

Apply the distributive property.

$4 (5 \tan^{2} (5 x) \sec (5 x)) + 4 (5 \sec^{3} (5 x))$

Step 15.2

Combine terms.

Tap for more steps...

Step 15.2.1

Multiply $5$ by $4$ .

$20 (\tan^{2} (5 x) \sec (5 x)) + 4 (5 \sec^{3} (5 x))$

Step 15.2.2

Multiply $5$ by $4$ .

$20 \tan^{2} (5 x) \sec (5 x) + 20 \sec^{3} (5 x)$