Calculus Examples

$- 18 \csc (2 t) \cot (2 t)$

Step 1

Since $- 18$ is constant with respect to $t$ , the derivative of $- 18 \csc (2 t) \cot (2 t)$ with respect to $t$ is $- 18 \frac{d}{d t} [\csc (2 t) \cot (2 t)]$ .

$- 18 \frac{d}{d t} [\csc (2 t) \cot (2 t)]$

Step 2

Differentiate using the Product Rule which states that $\frac{d}{d t} [f (t) g (t)]$ is $f (t) \frac{d}{d t} [g (t)] + g (t) \frac{d}{d t} [f (t)]$ where $f (t) = \csc (2 t)$ and $g (t) = \cot (2 t)$ .

$- 18 (\csc (2 t) \frac{d}{d t} [\cot (2 t)] + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 3

Differentiate using the chain rule, which states that $\frac{d}{d t} [f (g (t))]$ is $f' (g (t)) g' (t)$ where $f (t) = \cot (t)$ and $g (t) = 2 t$ .

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Step 3.1

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

$- 18 (\csc (2 t) (\frac{d}{d u_{1}} [\cot (u_{1})] \frac{d}{d t} [2 t]) + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 3.2

The derivative of $\cot (u_{1})$ with respect to $u_{1}$ is $- \csc^{2} (u_{1})$ .

$- 18 (\csc (2 t) (- \csc^{2} (u_{1}) \frac{d}{d t} [2 t]) + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 3.3

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

$- 18 (\csc (2 t) (- \csc^{2} (2 t) \frac{d}{d t} [2 t]) + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 4

Raise $\csc (2 t)$ to the power of $1$ .

$- 18 (- (\csc^{1} (2 t) \csc^{2} (2 t)) \frac{d}{d t} [2 t] + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 5

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

$- 18 (- {\csc (2 t)}^{1 + 2} \frac{d}{d t} [2 t] + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 6

Differentiate.

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Step 6.1

Add $1$ and $2$ .

$- 18 (- \csc^{3} (2 t) \frac{d}{d t} [2 t] + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 6.2

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

$- 18 (- \csc^{3} (2 t) (2 \frac{d}{d t} [t]) + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 6.3

Multiply $2$ by $- 1$ .

$- 18 (- 2 \csc^{3} (2 t) \frac{d}{d t} [t] + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 6.4

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

$- 18 (- 2 \csc^{3} (2 t) \cdot 1 + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 6.5

Multiply $- 2$ by $1$ .

$- 18 (- 2 \csc^{3} (2 t) + \cot (2 t) \frac{d}{d t} [\csc (2 t)])$

Step 7

Differentiate using the chain rule, which states that $\frac{d}{d t} [f (g (t))]$ is $f' (g (t)) g' (t)$ where $f (t) = \csc (t)$ and $g (t) = 2 t$ .

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Step 7.1

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

$- 18 (- 2 \csc^{3} (2 t) + \cot (2 t) (\frac{d}{d u_{2}} [\csc (u_{2})] \frac{d}{d t} [2 t]))$

Step 7.2

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

$- 18 (- 2 \csc^{3} (2 t) + \cot (2 t) (- \csc (u_{2}) \cot (u_{2}) \frac{d}{d t} [2 t]))$

Step 7.3

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

$- 18 (- 2 \csc^{3} (2 t) + \cot (2 t) (- \csc (2 t) \cot (2 t) \frac{d}{d t} [2 t]))$

Step 8

Raise $\cot (2 t)$ to the power of $1$ .

$- 18 (- 2 \csc^{3} (2 t) - \csc (2 t) (\cot^{1} (2 t) \cot (2 t)) \frac{d}{d t} [2 t])$

Step 9

Raise $\cot (2 t)$ to the power of $1$ .

$- 18 (- 2 \csc^{3} (2 t) - \csc (2 t) (\cot^{1} (2 t) \cot^{1} (2 t)) \frac{d}{d t} [2 t])$

Step 10

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

$- 18 (- 2 \csc^{3} (2 t) - \csc (2 t) {\cot (2 t)}^{1 + 1} \frac{d}{d t} [2 t])$

Step 11

Add $1$ and $1$ .

$- 18 (- 2 \csc^{3} (2 t) - \csc (2 t) \cot^{2} (2 t) \frac{d}{d t} [2 t])$

Step 12

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

$- 18 (- 2 \csc^{3} (2 t) - \csc (2 t) \cot^{2} (2 t) (2 \frac{d}{d t} [t]))$

Step 13

Multiply $2$ by $- 1$ .

$- 18 (- 2 \csc^{3} (2 t) - 2 \csc (2 t) \cot^{2} (2 t) \frac{d}{d t} [t])$

Step 14

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

$- 18 (- 2 \csc^{3} (2 t) - 2 \csc (2 t) \cot^{2} (2 t) \cdot 1)$

Step 15

Multiply $- 2$ by $1$ .

$- 18 (- 2 \csc^{3} (2 t) - 2 \csc (2 t) \cot^{2} (2 t))$

Step 16

Simplify.

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Step 16.1

Apply the distributive property.

$- 18 (- 2 \csc^{3} (2 t)) - 18 (- 2 \csc (2 t) \cot^{2} (2 t))$

Step 16.2

Combine terms.

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Step 16.2.1

Multiply $- 2$ by $- 18$ .

$36 \csc^{3} (2 t) - 18 (- 2 \csc (2 t) \cot^{2} (2 t))$

Step 16.2.2

Multiply $- 2$ by $- 18$ .

$36 \csc^{3} (2 t) + 36 \csc (2 t) \cot^{2} (2 t)$

Step 16.3

Reorder terms.

$36 \cot^{2} (2 t) \csc (2 t) + 36 \csc^{3} (2 t)$