Calculus Examples

$y = \cot^{2} (\cos^{4} (t))$

Step 1

Differentiate both sides of the equation.

$\frac{d}{d t} (y) = \frac{d}{d t} (\cot^{2} (\cos^{4} (t)))$

Step 2

The derivative of $y$ with respect to $t$ is $y'$ .

$y'$

Step 3

Differentiate the right side of the equation.

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Step 3.1

Differentiate using the chain rule, which states that $\frac{d}{d t} [f (g (t))]$ is $f' (g (t)) g' (t)$ where $f (t) = t^{2}$ and $g (t) = \cot (\cos^{4} (t))$ .

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Step 3.1.1

To apply the Chain Rule, set $u_{1}$ as $\cot (\cos^{4} (t))$ .

$\frac{d}{d u_{1}} [{u_{1}}^{2}] \frac{d}{d t} [\cot (\cos^{4} (t))]$

Step 3.1.2

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

$2 u_{1} \frac{d}{d t} [\cot (\cos^{4} (t))]$

Step 3.1.3

Replace all occurrences of $u_{1}$ with $\cot (\cos^{4} (t))$ .

$2 \cot (\cos^{4} (t)) \frac{d}{d t} [\cot (\cos^{4} (t))]$

Step 3.2

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 $g (t) = \cos^{4} (t)$ .

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Step 3.2.1

To apply the Chain Rule, set $u_{2}$ as $\cos^{4} (t)$ .

$2 \cot (\cos^{4} (t)) (\frac{d}{d u_{2}} [\cot (u_{2})] \frac{d}{d t} [\cos^{4} (t)])$

Step 3.2.2

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

$2 \cot (\cos^{4} (t)) (- \csc^{2} (u_{2}) \frac{d}{d t} [\cos^{4} (t)])$

Step 3.2.3

Replace all occurrences of $u_{2}$ with $\cos^{4} (t)$ .

$2 \cot (\cos^{4} (t)) (- \csc^{2} (\cos^{4} (t)) \frac{d}{d t} [\cos^{4} (t)])$

Step 3.3

Multiply $- 1$ by $2$ .

$- 2 \cot (\cos^{4} (t)) (\csc^{2} (\cos^{4} (t)) \frac{d}{d t} [\cos^{4} (t)])$

Step 3.4

Differentiate using the chain rule, which states that $\frac{d}{d t} [f (g (t))]$ is $f' (g (t)) g' (t)$ where $f (t) = t^{4}$ and $g (t) = \cos (t)$ .

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Step 3.4.1

To apply the Chain Rule, set $u_{3}$ as $\cos (t)$ .

$- 2 \cot (\cos^{4} (t)) \csc^{2} (\cos^{4} (t)) (\frac{d}{d u_{3}} [{u_{3}}^{4}] \frac{d}{d t} [\cos (t)])$

Step 3.4.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{3}} [{u_{3}}^{n}]$ is $n {u_{3}}^{n - 1}$ where $n = 4$ .

$- 2 \cot (\cos^{4} (t)) \csc^{2} (\cos^{4} (t)) (4 {u_{3}}^{3} \frac{d}{d t} [\cos (t)])$

Step 3.4.3

Replace all occurrences of $u_{3}$ with $\cos (t)$ .

$- 2 \cot (\cos^{4} (t)) \csc^{2} (\cos^{4} (t)) (4 \cos^{3} (t) \frac{d}{d t} [\cos (t)])$

Step 3.5

Multiply $4$ by $- 2$ .

$- 8 \cot (\cos^{4} (t)) \csc^{2} (\cos^{4} (t)) (\cos^{3} (t) \frac{d}{d t} [\cos (t)])$

Step 3.6

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

$- 8 \cot (\cos^{4} (t)) \csc^{2} (\cos^{4} (t)) \cos^{3} (t) (- \sin (t))$

Step 3.7

Multiply $- 1$ by $- 8$ .

$8 \cot (\cos^{4} (t)) \csc^{2} (\cos^{4} (t)) \cos^{3} (t) \sin (t)$

Step 3.8

Simplify.

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Step 3.8.1

Reorder the factors of $8 \cot (\cos^{4} (t)) \csc^{2} (\cos^{4} (t)) \cos^{3} (t) \sin (t)$ .

$8 \cos^{3} (t) \csc^{2} (\cos^{4} (t)) \cot (\cos^{4} (t)) \sin (t)$

Step 3.8.2

Rewrite $\csc (\cos^{4} (t))$ in terms of sines and cosines.

$8 \cos^{3} (t) {(\frac{1}{\sin (\cos^{4} (t))})}^{2} \cot (\cos^{4} (t)) \sin (t)$

Step 3.8.3

Apply the product rule to $\frac{1}{\sin (\cos^{4} (t))}$ .

$8 \cos^{3} (t) \frac{1^{2}}{\sin^{2} (\cos^{4} (t))} \cot (\cos^{4} (t)) \sin (t)$

Step 3.8.4

One to any power is one.

$8 \cos^{3} (t) \frac{1}{\sin^{2} (\cos^{4} (t))} \cot (\cos^{4} (t)) \sin (t)$

Step 3.8.5

Multiply $8 \cos^{3} (t) \frac{1}{\sin^{2} (\cos^{4} (t))}$ .

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Step 3.8.5.1

Combine $\frac{1}{\sin^{2} (\cos^{4} (t))}$ and $8$ .

$\frac{8}{\sin^{2} (\cos^{4} (t))} \cos^{3} (t) \cot (\cos^{4} (t)) \sin (t)$

Step 3.8.5.2

Combine $\frac{8}{\sin^{2} (\cos^{4} (t))}$ and $\cos^{3} (t)$ .

$\frac{8 \cos^{3} (t)}{\sin^{2} (\cos^{4} (t))} \cot (\cos^{4} (t)) \sin (t)$

Step 3.8.6

Rewrite $\cot (\cos^{4} (t))$ in terms of sines and cosines.

$\frac{8 \cos^{3} (t)}{\sin^{2} (\cos^{4} (t))} \cdot \frac{\cos (\cos^{4} (t))}{\sin (\cos^{4} (t))} \sin (t)$

Step 3.8.7

Combine.

$\frac{8 \cos^{3} (t) \cos (\cos^{4} (t))}{\sin^{2} (\cos^{4} (t)) \sin (\cos^{4} (t))} \sin (t)$

Step 3.8.8

Multiply $\sin^{2} (\cos^{4} (t))$ by $\sin (\cos^{4} (t))$ by adding the exponents.

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Step 3.8.8.1

Multiply $\sin^{2} (\cos^{4} (t))$ by $\sin (\cos^{4} (t))$ .

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Step 3.8.8.1.1

Raise $\sin (\cos^{4} (t))$ to the power of $1$ .

$\frac{8 \cos^{3} (t) \cos (\cos^{4} (t))}{\sin^{2} (\cos^{4} (t)) \sin^{1} (\cos^{4} (t))} \sin (t)$

Step 3.8.8.1.2

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

$\frac{8 \cos^{3} (t) \cos (\cos^{4} (t))}{{\sin (\cos^{4} (t))}^{2 + 1}} \sin (t)$

Step 3.8.8.2

Add $2$ and $1$ .

$\frac{8 \cos^{3} (t) \cos (\cos^{4} (t))}{\sin^{3} (\cos^{4} (t))} \sin (t)$

Step 3.8.9

Combine $\frac{8 \cos^{3} (t) \cos (\cos^{4} (t))}{\sin^{3} (\cos^{4} (t))}$ and $\sin (t)$ .

$\frac{8 \cos^{3} (t) \cos (\cos^{4} (t)) \sin (t)}{\sin^{3} (\cos^{4} (t))}$

Step 3.8.10

Multiply by $1$ .

$\frac{8 (\cos^{3} (t) \cdot 1) \cos (\cos^{4} (t)) \sin (t)}{\sin^{3} (\cos^{4} (t))}$

Step 3.8.11

Multiply by $1$ .

$\frac{8 (\cos^{3} (t) \cdot 1) \cos (\cos^{4} (t)) \sin (t)}{\sin^{3} (\cos^{4} (t)) \cdot 1}$

Step 3.8.12

Separate fractions.

$\frac{8 \cdot (1) \cos (\cos^{4} (t)) \sin (t)}{1} \cdot \frac{\cos^{3} (t)}{\sin^{3} (\cos^{4} (t))}$

Step 3.8.13

Convert from $\frac{1}{\sin^{3} (\cos^{4} (t))}$ to $\csc^{3} (\cos^{4} (t))$ .

$\frac{8 \cdot (1) \cos (\cos^{4} (t)) \sin (t)}{1} (\cos^{3} (t) \csc^{3} (\cos^{4} (t)))$

Step 3.8.14

Multiply $8$ by $1$ .

$\frac{8 \cos (\cos^{4} (t)) \sin (t)}{1} (\cos^{3} (t) \csc^{3} (\cos^{4} (t)))$

Step 3.8.15

Divide $8 \cos (\cos^{4} (t)) \sin (t)$ by $1$ .

$8 \cos (\cos^{4} (t)) \sin (t) \cos^{3} (t) \csc^{3} (\cos^{4} (t))$

Step 4

Reform the equation by setting the left side equal to the right side.

$y' = 8 \cos (\cos^{4} (t)) \sin (t) \cos^{3} (t) \csc^{3} (\cos^{4} (t))$

Step 5

Replace $y'$ with $\frac{d y}{d t}$ .

$\frac{d y}{d t} = 8 \cos (\cos^{4} (t)) \sin (t) \cos^{3} (t) \csc^{3} (\cos^{4} (t))$