Calculus Examples

$y = 3 (\sin (x) + \cos (x)) (\sin (x) - \cos (x))$

Step 1

Since $3$ is constant with respect to $x$ , the derivative of $3 (\sin (x) + \cos (x)) (\sin (x) - \cos (x))$ with respect to $x$ is $3 \frac{d}{d x} [(\sin (x) + \cos (x)) (\sin (x) - \cos (x))]$ .

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

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 $f (x) = \sin (x) + \cos (x)$ and $g (x) = \sin (x) - \cos (x)$ .

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

Step 3

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

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

Step 4

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

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

Step 5

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

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

Step 6

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

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

Step 7

Differentiate using the Sum Rule.

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Step 7.1

Multiply $- 1$ by $- 1$ .

$3 ((\sin (x) + \cos (x)) (\cos (x) + 1 \sin (x)) + (\sin (x) - \cos (x)) \frac{d}{d x} [\sin (x) + \cos (x)])$

Step 7.2

Multiply $\sin (x)$ by $1$ .

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

Step 7.3

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

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

Step 8

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

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

Step 9

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

$3 ((\sin (x) + \cos (x)) (\cos (x) + \sin (x)) + (\sin (x) - \cos (x)) (\cos (x) - \sin (x)))$

Step 10

Simplify.

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Step 10.1

Apply the distributive property.

$3 ((\sin (x) + \cos (x)) (\cos (x) + \sin (x))) + 3 ((\sin (x) - \cos (x)) (\cos (x) - \sin (x)))$

Step 10.2

Remove parentheses.

$3 (\sin (x) + \cos (x)) (\cos (x) + \sin (x)) + 3 (\sin (x) - \cos (x)) (\cos (x) - \sin (x))$

Step 10.3

Reorder terms.

$3 (\cos (x) + \sin (x)) (\sin (x) + \cos (x)) + 3 (\cos (x) - \sin (x)) (\sin (x) - \cos (x))$

Step 10.4

Simplify each term.

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Step 10.4.1

Apply the distributive property.

$(3 \cos (x) + 3 \sin (x)) (\sin (x) + \cos (x)) + 3 (\cos (x) - \sin (x)) (\sin (x) - \cos (x))$

Step 10.4.2

Expand $(3 \cos (x) + 3 \sin (x)) (\sin (x) + \cos (x))$ using the FOIL Method.

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Step 10.4.2.1

Apply the distributive property.

$3 \cos (x) (\sin (x) + \cos (x)) + 3 \sin (x) (\sin (x) + \cos (x)) + 3 (\cos (x) - \sin (x)) (\sin (x) - \cos (x))$

Step 10.4.2.2

Apply the distributive property.

$3 \cos (x) \sin (x) + 3 \cos (x) \cos (x) + 3 \sin (x) (\sin (x) + \cos (x)) + 3 (\cos (x) - \sin (x)) (\sin (x) - \cos (x))$

Step 10.4.2.3

Apply the distributive property.

$3 \cos (x) \sin (x) + 3 \cos (x) \cos (x) + 3 \sin (x) \sin (x) + 3 \sin (x) \cos (x) + 3 (\cos (x) - \sin (x)) (\sin (x) - \cos (x))$

Step 10.4.3

Simplify and combine like terms.

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Step 10.4.3.1

Simplify each term.

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Step 10.4.3.1.1

Multiply $3 \cos (x) \cos (x)$ .

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Step 10.4.3.1.1.1

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

$3 \cos (x) \sin (x) + 3 (\cos^{1} (x) \cos (x)) + 3 \sin (x) \sin (x) + 3 \sin (x) \cos (x) + 3 (\cos (x) - \sin (x)) (\sin (x) - \cos (x))$

Step 10.4.3.1.1.2

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

$3 \cos (x) \sin (x) + 3 (\cos^{1} (x) \cos^{1} (x)) + 3 \sin (x) \sin (x) + 3 \sin (x) \cos (x) + 3 (\cos (x) - \sin (x)) (\sin (x) - \cos (x))$

Step 10.4.3.1.1.3

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

$3 \cos (x) \sin (x) + 3 {\cos (x)}^{1 + 1} + 3 \sin (x) \sin (x) + 3 \sin (x) \cos (x) + 3 (\cos (x) - \sin (x)) (\sin (x) - \cos (x))$

Step 10.4.3.1.1.4

Add $1$ and $1$ .

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

Step 10.4.3.1.2

Multiply $3 \sin (x) \sin (x)$ .

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Step 10.4.3.1.2.1

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

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

Step 10.4.3.1.2.2

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

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

Step 10.4.3.1.2.3

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

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

Step 10.4.3.1.2.4

Add $1$ and $1$ .

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

Step 10.4.3.2

Reorder the factors of $3 \sin (x) \cos (x)$ .

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

Step 10.4.3.3

Add $3 \cos (x) \sin (x)$ and $3 \cos (x) \sin (x)$ .

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

Step 10.4.4

Factor $3$ out of $3 \cos^{2} (x)$ .

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

Step 10.4.5

Factor $3$ out of $3 \sin^{2} (x)$ .

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

Step 10.4.6

Factor $3$ out of $3 (\cos^{2} (x)) + 3 (\sin^{2} (x))$ .

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

Step 10.4.7

Rearrange terms.

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

Step 10.4.8

Apply pythagorean identity.

$6 \cos (x) \sin (x) + 3 \cdot 1 + 3 (\cos (x) - \sin (x)) (\sin (x) - \cos (x))$

Step 10.4.9

Multiply $3$ by $1$ .

$6 \cos (x) \sin (x) + 3 + 3 (\cos (x) - \sin (x)) (\sin (x) - \cos (x))$

Step 10.4.10

Apply the distributive property.

$6 \cos (x) \sin (x) + 3 + (3 \cos (x) + 3 (- \sin (x))) (\sin (x) - \cos (x))$

Step 10.4.11

Multiply $- 1$ by $3$ .

$6 \cos (x) \sin (x) + 3 + (3 \cos (x) - 3 \sin (x)) (\sin (x) - \cos (x))$

Step 10.4.12

Expand $(3 \cos (x) - 3 \sin (x)) (\sin (x) - \cos (x))$ using the FOIL Method.

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Step 10.4.12.1

Apply the distributive property.

$6 \cos (x) \sin (x) + 3 + 3 \cos (x) (\sin (x) - \cos (x)) - 3 \sin (x) (\sin (x) - \cos (x))$

Step 10.4.12.2

Apply the distributive property.

$6 \cos (x) \sin (x) + 3 + 3 \cos (x) \sin (x) + 3 \cos (x) (- \cos (x)) - 3 \sin (x) (\sin (x) - \cos (x))$

Step 10.4.12.3

Apply the distributive property.

$6 \cos (x) \sin (x) + 3 + 3 \cos (x) \sin (x) + 3 \cos (x) (- \cos (x)) - 3 \sin (x) \sin (x) - 3 \sin (x) (- \cos (x))$

Step 10.4.13

Simplify and combine like terms.

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Step 10.4.13.1

Simplify each term.

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Step 10.4.13.1.1

Multiply $3 \cos (x) (- \cos (x))$ .

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Step 10.4.13.1.1.1

Multiply $- 1$ by $3$ .

$6 \cos (x) \sin (x) + 3 + 3 \cos (x) \sin (x) - 3 \cos (x) \cos (x) - 3 \sin (x) \sin (x) - 3 \sin (x) (- \cos (x))$

Step 10.4.13.1.1.2

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

$6 \cos (x) \sin (x) + 3 + 3 \cos (x) \sin (x) - 3 (\cos^{1} (x) \cos (x)) - 3 \sin (x) \sin (x) - 3 \sin (x) (- \cos (x))$

Step 10.4.13.1.1.3

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

$6 \cos (x) \sin (x) + 3 + 3 \cos (x) \sin (x) - 3 (\cos^{1} (x) \cos^{1} (x)) - 3 \sin (x) \sin (x) - 3 \sin (x) (- \cos (x))$

Step 10.4.13.1.1.4

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

$6 \cos (x) \sin (x) + 3 + 3 \cos (x) \sin (x) - 3 {\cos (x)}^{1 + 1} - 3 \sin (x) \sin (x) - 3 \sin (x) (- \cos (x))$

Step 10.4.13.1.1.5

Add $1$ and $1$ .

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

Step 10.4.13.1.2

Multiply $- 3 \sin (x) \sin (x)$ .

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Step 10.4.13.1.2.1

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

$6 \cos (x) \sin (x) + 3 + 3 \cos (x) \sin (x) - 3 \cos^{2} (x) - 3 (\sin^{1} (x) \sin (x)) - 3 \sin (x) (- \cos (x))$

Step 10.4.13.1.2.2

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

$6 \cos (x) \sin (x) + 3 + 3 \cos (x) \sin (x) - 3 \cos^{2} (x) - 3 (\sin^{1} (x) \sin^{1} (x)) - 3 \sin (x) (- \cos (x))$

Step 10.4.13.1.2.3

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

$6 \cos (x) \sin (x) + 3 + 3 \cos (x) \sin (x) - 3 \cos^{2} (x) - 3 {\sin (x)}^{1 + 1} - 3 \sin (x) (- \cos (x))$

Step 10.4.13.1.2.4

Add $1$ and $1$ .

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

Step 10.4.13.1.3

Multiply $- 1$ by $- 3$ .

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

Step 10.4.13.2

Reorder the factors of $3 \sin (x) \cos (x)$ .

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

Step 10.4.13.3

Add $3 \cos (x) \sin (x)$ and $3 \cos (x) \sin (x)$ .

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

Step 10.4.14

Factor $- 3$ out of $- 3 \cos^{2} (x)$ .

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

Step 10.4.15

Factor $- 3$ out of $- 3 \sin^{2} (x)$ .

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

Step 10.4.16

Factor $- 3$ out of $- 3 (\cos^{2} (x)) - 3 (\sin^{2} (x))$ .

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

Step 10.4.17

Rearrange terms.

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

Step 10.4.18

Apply pythagorean identity.

$6 \cos (x) \sin (x) + 3 + 6 \cos (x) \sin (x) - 3 \cdot 1$

Step 10.4.19

Multiply $- 3$ by $1$ .

$6 \cos (x) \sin (x) + 3 + 6 \cos (x) \sin (x) - 3$

Step 10.5

Combine the opposite terms in $6 \cos (x) \sin (x) + 3 + 6 \cos (x) \sin (x) - 3$ .

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Step 10.5.1

Subtract $3$ from $3$ .

$6 \cos (x) \sin (x) + 6 \cos (x) \sin (x) + 0$

Step 10.5.2

Add $6 \cos (x) \sin (x) + 6 \cos (x) \sin (x)$ and $0$ .

$6 \cos (x) \sin (x) + 6 \cos (x) \sin (x)$

Step 10.6

Add $6 \cos (x) \sin (x)$ and $6 \cos (x) \sin (x)$ .

$12 \cos (x) \sin (x)$