Calculus Examples

$y = \frac{\tan (2 x)}{1 - \cot (2 x)}$

Step 1

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = \tan (2 x)$ and $g (x) = 1 - \cot (2 x)$ .

$\frac{(1 - \cot (2 x)) \frac{d}{d x} [\tan (2 x)] - \tan (2 x) \frac{d}{d x} [1 - \cot (2 x)]}{{(1 - \cot (2 x))}^{2}}$

Step 2

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

Tap for more steps...

Step 2.1

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

$\frac{(1 - \cot (2 x)) (\frac{d}{d u_{1}} [\tan (u_{1})] \frac{d}{d x} [2 x]) - \tan (2 x) \frac{d}{d x} [1 - \cot (2 x)]}{{(1 - \cot (2 x))}^{2}}$

Step 2.2

The derivative of $\tan (u_{1})$ with respect to $u_{1}$ is $\sec^{2} (u_{1})$ .

$\frac{(1 - \cot (2 x)) (\sec^{2} (u_{1}) \frac{d}{d x} [2 x]) - \tan (2 x) \frac{d}{d x} [1 - \cot (2 x)]}{{(1 - \cot (2 x))}^{2}}$

Step 2.3

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

$\frac{(1 - \cot (2 x)) (\sec^{2} (2 x) \frac{d}{d x} [2 x]) - \tan (2 x) \frac{d}{d x} [1 - \cot (2 x)]}{{(1 - \cot (2 x))}^{2}}$

Step 3

Differentiate.

Tap for more steps...

Step 3.1

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

$\frac{(1 - \cot (2 x)) \sec^{2} (2 x) (2 \frac{d}{d x} [x]) - \tan (2 x) \frac{d}{d x} [1 - \cot (2 x)]}{{(1 - \cot (2 x))}^{2}}$

Step 3.2

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

$\frac{(1 - \cot (2 x)) \sec^{2} (2 x) (2 \cdot 1) - \tan (2 x) \frac{d}{d x} [1 - \cot (2 x)]}{{(1 - \cot (2 x))}^{2}}$

Step 3.3

Simplify the expression.

Tap for more steps...

Step 3.3.1

Multiply $2$ by $1$ .

$\frac{(1 - \cot (2 x)) \sec^{2} (2 x) \cdot 2 - \tan (2 x) \frac{d}{d x} [1 - \cot (2 x)]}{{(1 - \cot (2 x))}^{2}}$

Step 3.3.2

Move $2$ to the left of $(1 - \cot (2 x)) \sec^{2} (2 x)$ .

$\frac{2 \cdot ((1 - \cot (2 x)) \sec^{2} (2 x)) - \tan (2 x) \frac{d}{d x} [1 - \cot (2 x)]}{{(1 - \cot (2 x))}^{2}}$

Step 3.4

By the Sum Rule, the derivative of $1 - \cot (2 x)$ with respect to $x$ is $\frac{d}{d x} [1] + \frac{d}{d x} [- \cot (2 x)]$ .

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

Step 3.5

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

$\frac{2 (1 - \cot (2 x)) \sec^{2} (2 x) - \tan (2 x) (0 + \frac{d}{d x} [- \cot (2 x)])}{{(1 - \cot (2 x))}^{2}}$

Step 3.6

Add $0$ and $\frac{d}{d x} [- \cot (2 x)]$ .

$\frac{2 (1 - \cot (2 x)) \sec^{2} (2 x) - \tan (2 x) \frac{d}{d x} [- \cot (2 x)]}{{(1 - \cot (2 x))}^{2}}$

Step 3.7

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

$\frac{2 (1 - \cot (2 x)) \sec^{2} (2 x) - \tan (2 x) (- \frac{d}{d x} [\cot (2 x)])}{{(1 - \cot (2 x))}^{2}}$

Step 3.8

Multiply.

Tap for more steps...

Step 3.8.1

Multiply $- 1$ by $- 1$ .

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

Step 3.8.2

Multiply $\tan (2 x)$ by $1$ .

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

Step 4

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

Tap for more steps...

Step 4.1

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

$\frac{2 (1 - \cot (2 x)) \sec^{2} (2 x) + \tan (2 x) (\frac{d}{d u_{2}} [\cot (u_{2})] \frac{d}{d x} [2 x])}{{(1 - \cot (2 x))}^{2}}$

Step 4.2

The derivative of $\cot (u_{2})$ with respect to $u_{2}$ is $- \csc^{2} (u_{2})$ .

$\frac{2 (1 - \cot (2 x)) \sec^{2} (2 x) + \tan (2 x) (- \csc^{2} (u_{2}) \frac{d}{d x} [2 x])}{{(1 - \cot (2 x))}^{2}}$

Step 4.3

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

$\frac{2 (1 - \cot (2 x)) \sec^{2} (2 x) + \tan (2 x) (- \csc^{2} (2 x) \frac{d}{d x} [2 x])}{{(1 - \cot (2 x))}^{2}}$

Step 5

Differentiate.

Tap for more steps...

Step 5.1

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

$\frac{2 (1 - \cot (2 x)) \sec^{2} (2 x) + \tan (2 x) (- \csc^{2} (2 x) (2 \frac{d}{d x} [x]))}{{(1 - \cot (2 x))}^{2}}$

Step 5.2

Multiply $2$ by $- 1$ .

$\frac{2 (1 - \cot (2 x)) \sec^{2} (2 x) + \tan (2 x) (- 2 \csc^{2} (2 x) \frac{d}{d x} [x])}{{(1 - \cot (2 x))}^{2}}$

Step 5.3

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

$\frac{2 (1 - \cot (2 x)) \sec^{2} (2 x) + \tan (2 x) (- 2 \csc^{2} (2 x) \cdot 1)}{{(1 - \cot (2 x))}^{2}}$

Step 5.4

Multiply $- 2$ by $1$ .

$\frac{2 (1 - \cot (2 x)) \sec^{2} (2 x) + \tan (2 x) (- 2 \csc^{2} (2 x))}{{(1 - \cot (2 x))}^{2}}$

Step 6

Simplify.

Tap for more steps...

Step 6.1

Apply the distributive property.

$\frac{(2 \cdot 1 + 2 (- \cot (2 x))) \sec^{2} (2 x) + \tan (2 x) (- 2 \csc^{2} (2 x))}{{(1 - \cot (2 x))}^{2}}$

Step 6.2

Apply the distributive property.

$\frac{2 \cdot 1 \sec^{2} (2 x) + 2 (- \cot (2 x)) \sec^{2} (2 x) + \tan (2 x) (- 2 \csc^{2} (2 x))}{{(1 - \cot (2 x))}^{2}}$

Step 6.3

Simplify each term.

Tap for more steps...

Step 6.3.1

Multiply $2$ by $1$ .

$\frac{2 \sec^{2} (2 x) + 2 (- \cot (2 x)) \sec^{2} (2 x) + \tan (2 x) (- 2 \csc^{2} (2 x))}{{(1 - \cot (2 x))}^{2}}$

Step 6.3.2

Multiply $- 1$ by $2$ .

$\frac{2 \sec^{2} (2 x) - 2 \cot (2 x) \sec^{2} (2 x) + \tan (2 x) (- 2 \csc^{2} (2 x))}{{(1 - \cot (2 x))}^{2}}$

Step 6.3.3

Rewrite using the commutative property of multiplication.

$\frac{2 \sec^{2} (2 x) - 2 \cot (2 x) \sec^{2} (2 x) - 2 \tan (2 x) \csc^{2} (2 x)}{{(1 - \cot (2 x))}^{2}}$

Step 6.4

Reorder terms.

$\frac{- 2 \sec^{2} (2 x) \cot (2 x) - 2 \csc^{2} (2 x) \tan (2 x) + 2 \sec^{2} (2 x)}{{(1 - \cot (2 x))}^{2}}$