Calculus Examples

${(3 x + 2)}^{2} e^{5 x} + \sin (3 x)$

Step 1

Rewrite ${(3 x + 2)}^{2}$ as $(3 x + 2) (3 x + 2)$ .

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

Step 2

Expand $(3 x + 2) (3 x + 2)$ using the FOIL Method.

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Step 2.1

Apply the distributive property.

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

Step 2.2

Apply the distributive property.

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

Step 2.3

Apply the distributive property.

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

Step 3

Simplify and combine like terms.

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Step 3.1

Simplify each term.

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Step 3.1.1

Rewrite using the commutative property of multiplication.

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

Step 3.1.2

Multiply $x$ by $x$ by adding the exponents.

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Step 3.1.2.1

Move $x$ .

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

Step 3.1.2.2

Multiply $x$ by $x$ .

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

Step 3.1.3

Multiply $3$ by $3$ .

$\frac{d}{d x} [(9 x^{2} + 3 x \cdot 2 + 2 (3 x) + 2 \cdot 2) e^{5 x} + \sin (3 x)]$

Step 3.1.4

Multiply $2$ by $3$ .

$\frac{d}{d x} [(9 x^{2} + 6 x + 2 (3 x) + 2 \cdot 2) e^{5 x} + \sin (3 x)]$

Step 3.1.5

Multiply $3$ by $2$ .

$\frac{d}{d x} [(9 x^{2} + 6 x + 6 x + 2 \cdot 2) e^{5 x} + \sin (3 x)]$

Step 3.1.6

Multiply $2$ by $2$ .

$\frac{d}{d x} [(9 x^{2} + 6 x + 6 x + 4) e^{5 x} + \sin (3 x)]$

Step 3.2

Add $6 x$ and $6 x$ .

$\frac{d}{d x} [(9 x^{2} + 12 x + 4) e^{5 x} + \sin (3 x)]$

Step 4

By the Sum Rule, the derivative of $(9 x^{2} + 12 x + 4) e^{5 x} + \sin (3 x)$ with respect to $x$ is $\frac{d}{d x} [(9 x^{2} + 12 x + 4) e^{5 x}] + \frac{d}{d x} [\sin (3 x)]$ .

$\frac{d}{d x} [(9 x^{2} + 12 x + 4) e^{5 x}] + \frac{d}{d x} [\sin (3 x)]$

Step 5

Evaluate $\frac{d}{d x} [(9 x^{2} + 12 x + 4) e^{5 x}]$ .

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Step 5.1

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 $f (x) = 9 x^{2} + 12 x + 4$ and $g (x) = e^{5 x}$ .

$(9 x^{2} + 12 x + 4) \frac{d}{d x} [e^{5 x}] + e^{5 x} \frac{d}{d x} [9 x^{2} + 12 x + 4] + \frac{d}{d x} [\sin (3 x)]$

Step 5.2

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

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Step 5.2.1

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

$(9 x^{2} + 12 x + 4) (\frac{d}{d u_{1}} [e^{u_{1}}] \frac{d}{d x} [5 x]) + e^{5 x} \frac{d}{d x} [9 x^{2} + 12 x + 4] + \frac{d}{d x} [\sin (3 x)]$

Step 5.2.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{1}} [a^{u_{1}}]$ is $a^{u_{1}} \ln (a)$ where $a$ = $e$ .

$(9 x^{2} + 12 x + 4) (e^{u_{1}} \frac{d}{d x} [5 x]) + e^{5 x} \frac{d}{d x} [9 x^{2} + 12 x + 4] + \frac{d}{d x} [\sin (3 x)]$

Step 5.2.3

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

$(9 x^{2} + 12 x + 4) (e^{5 x} \frac{d}{d x} [5 x]) + e^{5 x} \frac{d}{d x} [9 x^{2} + 12 x + 4] + \frac{d}{d x} [\sin (3 x)]$

Step 5.3

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

$(9 x^{2} + 12 x + 4) (e^{5 x} (5 \frac{d}{d x} [x])) + e^{5 x} \frac{d}{d x} [9 x^{2} + 12 x + 4] + \frac{d}{d x} [\sin (3 x)]$

Step 5.4

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

$(9 x^{2} + 12 x + 4) (e^{5 x} (5 \cdot 1)) + e^{5 x} \frac{d}{d x} [9 x^{2} + 12 x + 4] + \frac{d}{d x} [\sin (3 x)]$

Step 5.5

By the Sum Rule, the derivative of $9 x^{2} + 12 x + 4$ with respect to $x$ is $\frac{d}{d x} [9 x^{2}] + \frac{d}{d x} [12 x] + \frac{d}{d x} [4]$ .

$(9 x^{2} + 12 x + 4) (e^{5 x} (5 \cdot 1)) + e^{5 x} (\frac{d}{d x} [9 x^{2}] + \frac{d}{d x} [12 x] + \frac{d}{d x} [4]) + \frac{d}{d x} [\sin (3 x)]$

Step 5.6

Since $9$ is constant with respect to $x$ , the derivative of $9 x^{2}$ with respect to $x$ is $9 \frac{d}{d x} [x^{2}]$ .

$(9 x^{2} + 12 x + 4) (e^{5 x} (5 \cdot 1)) + e^{5 x} (9 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [12 x] + \frac{d}{d x} [4]) + \frac{d}{d x} [\sin (3 x)]$

Step 5.7

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

$(9 x^{2} + 12 x + 4) (e^{5 x} (5 \cdot 1)) + e^{5 x} (9 (2 x) + \frac{d}{d x} [12 x] + \frac{d}{d x} [4]) + \frac{d}{d x} [\sin (3 x)]$

Step 5.8

Since $12$ is constant with respect to $x$ , the derivative of $12 x$ with respect to $x$ is $12 \frac{d}{d x} [x]$ .

$(9 x^{2} + 12 x + 4) (e^{5 x} (5 \cdot 1)) + e^{5 x} (9 (2 x) + 12 \frac{d}{d x} [x] + \frac{d}{d x} [4]) + \frac{d}{d x} [\sin (3 x)]$

Step 5.9

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

$(9 x^{2} + 12 x + 4) (e^{5 x} (5 \cdot 1)) + e^{5 x} (9 (2 x) + 12 \cdot 1 + \frac{d}{d x} [4]) + \frac{d}{d x} [\sin (3 x)]$

Step 5.10

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

$(9 x^{2} + 12 x + 4) (e^{5 x} (5 \cdot 1)) + e^{5 x} (9 (2 x) + 12 \cdot 1 + 0) + \frac{d}{d x} [\sin (3 x)]$

Step 5.11

Multiply $5$ by $1$ .

$(9 x^{2} + 12 x + 4) (e^{5 x} \cdot 5) + e^{5 x} (9 (2 x) + 12 \cdot 1 + 0) + \frac{d}{d x} [\sin (3 x)]$

Step 5.12

Move $5$ to the left of $e^{5 x}$ .

$(9 x^{2} + 12 x + 4) (5 \cdot e^{5 x}) + e^{5 x} (9 (2 x) + 12 \cdot 1 + 0) + \frac{d}{d x} [\sin (3 x)]$

Step 5.13

Move $5$ to the left of $9 x^{2} + 12 x + 4$ .

$5 \cdot (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (9 (2 x) + 12 \cdot 1 + 0) + \frac{d}{d x} [\sin (3 x)]$

Step 5.14

Multiply $2$ by $9$ .

$5 (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (18 x + 12 \cdot 1 + 0) + \frac{d}{d x} [\sin (3 x)]$

Step 5.15

Multiply $12$ by $1$ .

$5 (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (18 x + 12 + 0) + \frac{d}{d x} [\sin (3 x)]$

Step 5.16

Add $18 x + 12$ and $0$ .

$5 (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (18 x + 12) + \frac{d}{d x} [\sin (3 x)]$

Step 6

Evaluate $\frac{d}{d x} [\sin (3 x)]$ .

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Step 6.1

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \sin (x)$ and $g (x) = 3 x$ .

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Step 6.1.1

To apply the Chain Rule, set $u_{2}$ as $3 x$ .

$5 (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (18 x + 12) + \frac{d}{d u_{2}} [\sin (u_{2})] \frac{d}{d x} [3 x]$

Step 6.1.2

The derivative of $\sin (u_{2})$ with respect to $u_{2}$ is $\cos (u_{2})$ .

$5 (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (18 x + 12) + \cos (u_{2}) \frac{d}{d x} [3 x]$

Step 6.1.3

Replace all occurrences of $u_{2}$ with $3 x$ .

$5 (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (18 x + 12) + \cos (3 x) \frac{d}{d x} [3 x]$

Step 6.2

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

$5 (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (18 x + 12) + \cos (3 x) (3 \frac{d}{d x} [x])$

Step 6.3

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

$5 (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (18 x + 12) + \cos (3 x) (3 \cdot 1)$

Step 6.4

Multiply $3$ by $1$ .

$5 (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (18 x + 12) + \cos (3 x) \cdot 3$

Step 6.5

Move $3$ to the left of $\cos (3 x)$ .

$5 (9 x^{2} + 12 x + 4) e^{5 x} + e^{5 x} (18 x + 12) + 3 \cos (3 x)$

Step 7

Simplify.

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Step 7.1

Apply the distributive property.

$(5 (9 x^{2}) + 5 (12 x) + 5 \cdot 4) e^{5 x} + e^{5 x} (18 x + 12) + 3 \cos (3 x)$

Step 7.2

Apply the distributive property.

$5 (9 x^{2}) e^{5 x} + 5 (12 x) e^{5 x} + 5 \cdot 4 e^{5 x} + e^{5 x} (18 x + 12) + 3 \cos (3 x)$

Step 7.3

Apply the distributive property.

$5 (9 x^{2}) e^{5 x} + 5 (12 x) e^{5 x} + 5 \cdot 4 e^{5 x} + e^{5 x} (18 x) + e^{5 x} \cdot 12 + 3 \cos (3 x)$

Step 7.4

Combine terms.

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Step 7.4.1

Multiply $9$ by $5$ .

$45 x^{2} e^{5 x} + 5 (12 x) e^{5 x} + 5 \cdot 4 e^{5 x} + e^{5 x} (18 x) + e^{5 x} \cdot 12 + 3 \cos (3 x)$

Step 7.4.2

Multiply $12$ by $5$ .

$45 x^{2} e^{5 x} + 60 x e^{5 x} + 5 \cdot 4 e^{5 x} + e^{5 x} (18 x) + e^{5 x} \cdot 12 + 3 \cos (3 x)$

Step 7.4.3

Multiply $5$ by $4$ .

$45 x^{2} e^{5 x} + 60 x e^{5 x} + 20 e^{5 x} + e^{5 x} (18 x) + e^{5 x} \cdot 12 + 3 \cos (3 x)$

Step 7.4.4

Move $12$ to the left of $e^{5 x}$ .

$45 x^{2} e^{5 x} + 60 x e^{5 x} + 20 e^{5 x} + e^{5 x} (18 x) + 12 \cdot e^{5 x} + 3 \cos (3 x)$

Step 7.4.5

Add $60 x e^{5 x}$ and $e^{5 x} (18 x)$ .

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Step 7.4.5.1

Move $e^{5 x}$ .

$45 x^{2} e^{5 x} + 60 x e^{5 x} + 18 x e^{5 x} + 20 e^{5 x} + 12 e^{5 x} + 3 \cos (3 x)$

Step 7.4.5.2

Add $60 x e^{5 x}$ and $18 x e^{5 x}$ .

$45 x^{2} e^{5 x} + 78 x e^{5 x} + 20 e^{5 x} + 12 e^{5 x} + 3 \cos (3 x)$

Step 7.4.6

Add $20 e^{5 x}$ and $12 e^{5 x}$ .

$45 x^{2} e^{5 x} + 78 x e^{5 x} + 32 e^{5 x} + 3 \cos (3 x)$

Step 7.5

Reorder terms.

$45 e^{5 x} x^{2} + 78 e^{5 x} x + 32 e^{5 x} + 3 \cos (3 x)$

Step 7.6

Reorder factors in $45 e^{5 x} x^{2} + 78 e^{5 x} x + 32 e^{5 x} + 3 \cos (3 x)$ .

$45 x^{2} e^{5 x} + 78 x e^{5 x} + 32 e^{5 x} + 3 \cos (3 x)$