Calculus Examples

$y = \frac{\tan (2 x) - e^{x}}{3 x - 4}$

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 $f (x) = \tan (2 x) - e^{x}$ and $g (x) = 3 x - 4$ .

$\frac{(3 x - 4) \frac{d}{d x} [\tan (2 x) - e^{x}] - (\tan (2 x) - e^{x}) \frac{d}{d x} [3 x - 4]}{{(3 x - 4)}^{2}}$

Step 2

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

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

Step 3

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

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Step 3.1

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

$\frac{(3 x - 4) (\frac{d}{d u} [\tan (u)] \frac{d}{d x} [2 x] + \frac{d}{d x} [- e^{x}]) - (\tan (2 x) - e^{x}) \frac{d}{d x} [3 x - 4]}{{(3 x - 4)}^{2}}$

Step 3.2

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

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

Step 3.3

Replace all occurrences of $u$ with $2 x$ .

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

Step 4

Differentiate.

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Step 4.1

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

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

Step 4.2

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

$\frac{(3 x - 4) (\sec^{2} (2 x) (2 \cdot 1) + \frac{d}{d x} [- e^{x}]) - (\tan (2 x) - e^{x}) \frac{d}{d x} [3 x - 4]}{{(3 x - 4)}^{2}}$

Step 4.3

Simplify the expression.

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Step 4.3.1

Multiply $2$ by $1$ .

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

Step 4.3.2

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

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

Step 4.4

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

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

Step 5

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

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

Step 6

Differentiate.

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Step 6.1

By the Sum Rule, the derivative of $3 x - 4$ with respect to $x$ is $\frac{d}{d x} [3 x] + \frac{d}{d x} [- 4]$ .

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

Step 6.2

Since $3$ is constant with respect to $x$ , the derivative of $3 x$ with respect to $x$ is $3 \frac{d}{d x} [x]$ .

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

Step 6.3

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

$\frac{(3 x - 4) (2 \sec^{2} (2 x) - e^{x}) - (\tan (2 x) - e^{x}) (3 \cdot 1 + \frac{d}{d x} [- 4])}{{(3 x - 4)}^{2}}$

Step 6.4

Multiply $3$ by $1$ .

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

Step 6.5

Since $- 4$ is constant with respect to $x$ , the derivative of $- 4$ with respect to $x$ is $0$ .

$\frac{(3 x - 4) (2 \sec^{2} (2 x) - e^{x}) - (\tan (2 x) - e^{x}) (3 + 0)}{{(3 x - 4)}^{2}}$

Step 6.6

Simplify the expression.

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Step 6.6.1

Add $3$ and $0$ .

$\frac{(3 x - 4) (2 \sec^{2} (2 x) - e^{x}) - (\tan (2 x) - e^{x}) \cdot 3}{{(3 x - 4)}^{2}}$

Step 6.6.2

Multiply $3$ by $- 1$ .

$\frac{(3 x - 4) (2 \sec^{2} (2 x) - e^{x}) - 3 (\tan (2 x) - e^{x})}{{(3 x - 4)}^{2}}$

Step 7

Simplify.

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Step 7.1

Apply the distributive property.

$\frac{(3 x - 4) (2 \sec^{2} (2 x) - e^{x}) - 3 \tan (2 x) - 3 (- e^{x})}{{(3 x - 4)}^{2}}$

Step 7.2

Simplify the numerator.

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Step 7.2.1

Simplify each term.

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Step 7.2.1.1

Expand $(3 x - 4) (2 \sec^{2} (2 x) - e^{x})$ using the FOIL Method.

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Step 7.2.1.1.1

Apply the distributive property.

$\frac{3 x (2 \sec^{2} (2 x) - e^{x}) - 4 (2 \sec^{2} (2 x) - e^{x}) - 3 \tan (2 x) - 3 (- e^{x})}{{(3 x - 4)}^{2}}$

Step 7.2.1.1.2

Apply the distributive property.

$\frac{3 x (2 \sec^{2} (2 x)) + 3 x (- e^{x}) - 4 (2 \sec^{2} (2 x) - e^{x}) - 3 \tan (2 x) - 3 (- e^{x})}{{(3 x - 4)}^{2}}$

Step 7.2.1.1.3

Apply the distributive property.

$\frac{3 x (2 \sec^{2} (2 x)) + 3 x (- e^{x}) - 4 (2 \sec^{2} (2 x)) - 4 (- e^{x}) - 3 \tan (2 x) - 3 (- e^{x})}{{(3 x - 4)}^{2}}$

Step 7.2.1.2

Simplify each term.

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Step 7.2.1.2.1

Rewrite using the commutative property of multiplication.

$\frac{3 \cdot 2 x \sec^{2} (2 x) + 3 x (- e^{x}) - 4 (2 \sec^{2} (2 x)) - 4 (- e^{x}) - 3 \tan (2 x) - 3 (- e^{x})}{{(3 x - 4)}^{2}}$

Step 7.2.1.2.2

Multiply $3$ by $2$ .

$\frac{6 x \sec^{2} (2 x) + 3 x (- e^{x}) - 4 (2 \sec^{2} (2 x)) - 4 (- e^{x}) - 3 \tan (2 x) - 3 (- e^{x})}{{(3 x - 4)}^{2}}$

Step 7.2.1.2.3

Rewrite using the commutative property of multiplication.

$\frac{6 x \sec^{2} (2 x) + 3 \cdot - 1 x e^{x} - 4 (2 \sec^{2} (2 x)) - 4 (- e^{x}) - 3 \tan (2 x) - 3 (- e^{x})}{{(3 x - 4)}^{2}}$

Step 7.2.1.2.4

Multiply $3$ by $- 1$ .

$\frac{6 x \sec^{2} (2 x) - 3 x e^{x} - 4 (2 \sec^{2} (2 x)) - 4 (- e^{x}) - 3 \tan (2 x) - 3 (- e^{x})}{{(3 x - 4)}^{2}}$

Step 7.2.1.2.5

Multiply $2$ by $- 4$ .

$\frac{6 x \sec^{2} (2 x) - 3 x e^{x} - 8 \sec^{2} (2 x) - 4 (- e^{x}) - 3 \tan (2 x) - 3 (- e^{x})}{{(3 x - 4)}^{2}}$

Step 7.2.1.2.6

Multiply $- 1$ by $- 4$ .

$\frac{6 x \sec^{2} (2 x) - 3 x e^{x} - 8 \sec^{2} (2 x) + 4 e^{x} - 3 \tan (2 x) - 3 (- e^{x})}{{(3 x - 4)}^{2}}$

Step 7.2.1.3

Multiply $- 1$ by $- 3$ .

$\frac{6 x \sec^{2} (2 x) - 3 x e^{x} - 8 \sec^{2} (2 x) + 4 e^{x} - 3 \tan (2 x) + 3 e^{x}}{{(3 x - 4)}^{2}}$

Step 7.2.2

Add $4 e^{x}$ and $3 e^{x}$ .

$\frac{6 x \sec^{2} (2 x) - 3 x e^{x} - 8 \sec^{2} (2 x) + 7 e^{x} - 3 \tan (2 x)}{{(3 x - 4)}^{2}}$

Step 7.3

Reorder terms.

$\frac{6 x \sec^{2} (2 x) - 3 e^{x} x + 7 e^{x} - 8 \sec^{2} (2 x) - 3 \tan (2 x)}{{(3 x - 4)}^{2}}$