Calculus Examples

$\frac{5 \cos (\frac{2 t}{π})}{2 + \sin (\frac{2 t}{π})} + 6$

Step 1

By the Sum Rule, the derivative of $\frac{5 \cos (\frac{2 t}{π})}{2 + \sin (\frac{2 t}{π})} + 6$ with respect to $t$ is $\frac{d}{d t} [\frac{5 \cos (\frac{2 t}{π})}{2 + \sin (\frac{2 t}{π})}] + \frac{d}{d t} [6]$ .

$\frac{d}{d t} [\frac{5 \cos (\frac{2 t}{π})}{2 + \sin (\frac{2 t}{π})}] + \frac{d}{d t} [6]$

Step 2

Evaluate $\frac{d}{d t} [\frac{5 \cos (\frac{2 t}{π})}{2 + \sin (\frac{2 t}{π})}]$ .

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Step 2.1

Since $5$ is constant with respect to $t$ , the derivative of $\frac{5 \cos (\frac{2 t}{π})}{2 + \sin (\frac{2 t}{π})}$ with respect to $t$ is $5 \frac{d}{d t} [\frac{\cos (\frac{2 t}{π})}{2 + \sin (\frac{2 t}{π})}]$ .

$5 \frac{d}{d t} [\frac{\cos (\frac{2 t}{π})}{2 + \sin (\frac{2 t}{π})}] + \frac{d}{d t} [6]$

Step 2.2

Differentiate using the Quotient Rule which states that $\frac{d}{d t} [\frac{f (t)}{g (t)}]$ is $\frac{g (t) \frac{d}{d t} [f (t)] - f (t) \frac{d}{d t} [g (t)]}{{g (t)}^{2}}$ where $f (t) = \cos (\frac{2 t}{π})$ and $g (t) = 2 + \sin (\frac{2 t}{π})$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) \frac{d}{d t} [\cos (\frac{2 t}{π})] - \cos (\frac{2 t}{π}) \frac{d}{d t} [2 + \sin (\frac{2 t}{π})]}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.3

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

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Step 2.3.1

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

$5 \frac{(2 + \sin (\frac{2 t}{π})) (\frac{d}{d u_{1}} [\cos (u_{1})] \frac{d}{d t} [\frac{2 t}{π}]) - \cos (\frac{2 t}{π}) \frac{d}{d t} [2 + \sin (\frac{2 t}{π})]}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.3.2

The derivative of $\cos (u_{1})$ with respect to $u_{1}$ is $- \sin (u_{1})$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (u_{1}) \frac{d}{d t} [\frac{2 t}{π}]) - \cos (\frac{2 t}{π}) \frac{d}{d t} [2 + \sin (\frac{2 t}{π})]}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.3.3

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

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) \frac{d}{d t} [\frac{2 t}{π}]) - \cos (\frac{2 t}{π}) \frac{d}{d t} [2 + \sin (\frac{2 t}{π})]}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.4

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

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) (\frac{2}{π} \frac{d}{d t} [t])) - \cos (\frac{2 t}{π}) \frac{d}{d t} [2 + \sin (\frac{2 t}{π})]}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.5

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

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) (\frac{2}{π} \cdot 1)) - \cos (\frac{2 t}{π}) \frac{d}{d t} [2 + \sin (\frac{2 t}{π})]}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.6

By the Sum Rule, the derivative of $2 + \sin (\frac{2 t}{π})$ with respect to $t$ is $\frac{d}{d t} [2] + \frac{d}{d t} [\sin (\frac{2 t}{π})]$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) (\frac{2}{π} \cdot 1)) - \cos (\frac{2 t}{π}) (\frac{d}{d t} [2] + \frac{d}{d t} [\sin (\frac{2 t}{π})])}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.7

Since $2$ is constant with respect to $t$ , the derivative of $2$ with respect to $t$ is $0$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) (\frac{2}{π} \cdot 1)) - \cos (\frac{2 t}{π}) (0 + \frac{d}{d t} [\sin (\frac{2 t}{π})])}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.8

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

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Step 2.8.1

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

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) (\frac{2}{π} \cdot 1)) - \cos (\frac{2 t}{π}) (0 + \frac{d}{d u_{2}} [\sin (u_{2})] \frac{d}{d t} [\frac{2 t}{π}])}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.8.2

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

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) (\frac{2}{π} \cdot 1)) - \cos (\frac{2 t}{π}) (0 + \cos (u_{2}) \frac{d}{d t} [\frac{2 t}{π}])}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.8.3

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

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) (\frac{2}{π} \cdot 1)) - \cos (\frac{2 t}{π}) (0 + \cos (\frac{2 t}{π}) \frac{d}{d t} [\frac{2 t}{π}])}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.9

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

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) (\frac{2}{π} \cdot 1)) - \cos (\frac{2 t}{π}) (0 + \cos (\frac{2 t}{π}) (\frac{2}{π} \frac{d}{d t} [t]))}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.10

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

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) (\frac{2}{π} \cdot 1)) - \cos (\frac{2 t}{π}) (0 + \cos (\frac{2 t}{π}) (\frac{2}{π} \cdot 1))}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.11

Multiply $\frac{2}{π}$ by $1$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \sin (\frac{2 t}{π}) \frac{2}{π}) - \cos (\frac{2 t}{π}) (0 + \cos (\frac{2 t}{π}) (\frac{2}{π} \cdot 1))}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.12

Combine $\frac{2}{π}$ and $\sin (\frac{2 t}{π})$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) - \cos (\frac{2 t}{π}) (0 + \cos (\frac{2 t}{π}) (\frac{2}{π} \cdot 1))}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.13

Multiply $\frac{2}{π}$ by $1$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) - \cos (\frac{2 t}{π}) (0 + \cos (\frac{2 t}{π}) \frac{2}{π})}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.14

Combine $\cos (\frac{2 t}{π})$ and $\frac{2}{π}$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) - \cos (\frac{2 t}{π}) (0 + \frac{\cos (\frac{2 t}{π}) \cdot 2}{π})}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.15

Move $2$ to the left of $\cos (\frac{2 t}{π})$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) - \cos (\frac{2 t}{π}) (0 + \frac{2 \cdot \cos (\frac{2 t}{π})}{π})}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.16

Add $0$ and $\frac{2 \cos (\frac{2 t}{π})}{π}$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) - \cos (\frac{2 t}{π}) \frac{2 \cos (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.17

Combine $\frac{2 \cos (\frac{2 t}{π})}{π}$ and $\cos (\frac{2 t}{π})$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) - \frac{2 \cos (\frac{2 t}{π}) \cos (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.18

Raise $\cos (\frac{2 t}{π})$ to the power of $1$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) - \frac{2 (\cos^{1} (\frac{2 t}{π}) \cos (\frac{2 t}{π}))}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.19

Raise $\cos (\frac{2 t}{π})$ to the power of $1$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) - \frac{2 (\cos^{1} (\frac{2 t}{π}) \cos^{1} (\frac{2 t}{π}))}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.20

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

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) - \frac{2 {\cos (\frac{2 t}{π})}^{1 + 1}}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.21

Add $1$ and $1$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) - \frac{2 \cos^{2} (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.22

To write $(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π})$ as a fraction with a common denominator, multiply by $\frac{π}{π}$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) \cdot \frac{π}{π} - \frac{2 \cos^{2} (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.23

Combine $(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π})$ and $\frac{π}{π}$ .

$5 \frac{\frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) π}{π} - \frac{2 \cos^{2} (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.24

Combine the numerators over the common denominator.

$5 \frac{\frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \sin (\frac{2 t}{π})}{π}) π - 2 \cos^{2} (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.25

Combine $π$ and $\frac{2 \sin (\frac{2 t}{π})}{π}$ .

$5 \frac{\frac{(2 + \sin (\frac{2 t}{π})) (- \frac{π (2 \sin (\frac{2 t}{π}))}{π}) - 2 \cos^{2} (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.26

Move $2$ to the left of $π$ .

$5 \frac{\frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 \cdot π \sin (\frac{2 t}{π})}{π}) - 2 \cos^{2} (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.27

Cancel the common factor of $π$ .

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Step 2.27.1

Cancel the common factor.

$5 \frac{\frac{(2 + \sin (\frac{2 t}{π})) (- \frac{2 π \sin (\frac{2 t}{π})}{π}) - 2 \cos^{2} (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.27.2

Divide $2 \sin (\frac{2 t}{π})$ by $1$ .

$5 \frac{\frac{(2 + \sin (\frac{2 t}{π})) (- (2 \sin (\frac{2 t}{π}))) - 2 \cos^{2} (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.28

Multiply $2$ by $- 1$ .

$5 \frac{\frac{(2 + \sin (\frac{2 t}{π})) (- 2 \sin (\frac{2 t}{π})) - 2 \cos^{2} (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.29

Rewrite $\frac{\frac{(2 + \sin (\frac{2 t}{π})) (- 2 \sin (\frac{2 t}{π})) - 2 \cos^{2} (\frac{2 t}{π})}{π}}{{(2 + \sin (\frac{2 t}{π}))}^{2}}$ as a product.

$5 (\frac{(2 + \sin (\frac{2 t}{π})) (- 2 \sin (\frac{2 t}{π})) - 2 \cos^{2} (\frac{2 t}{π})}{π} \cdot \frac{1}{{(2 + \sin (\frac{2 t}{π}))}^{2}}) + \frac{d}{d t} [6]$

Step 2.30

Multiply $\frac{(2 + \sin (\frac{2 t}{π})) (- 2 \sin (\frac{2 t}{π})) - 2 \cos^{2} (\frac{2 t}{π})}{π}$ by $\frac{1}{{(2 + \sin (\frac{2 t}{π}))}^{2}}$ .

$5 \frac{(2 + \sin (\frac{2 t}{π})) (- 2 \sin (\frac{2 t}{π})) - 2 \cos^{2} (\frac{2 t}{π})}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 2.31

Combine $5$ and $\frac{(2 + \sin (\frac{2 t}{π})) (- 2 \sin (\frac{2 t}{π})) - 2 \cos^{2} (\frac{2 t}{π})}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$ .

$\frac{5 ((2 + \sin (\frac{2 t}{π})) (- 2 \sin (\frac{2 t}{π})) - 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + \frac{d}{d t} [6]$

Step 3

Since $6$ is constant with respect to $t$ , the derivative of $6$ with respect to $t$ is $0$ .

$\frac{5 ((2 + \sin (\frac{2 t}{π})) (- 2 \sin (\frac{2 t}{π})) - 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

$\frac{5 (2 (- 2 \sin (\frac{2 t}{π})) + \sin (\frac{2 t}{π}) (- 2 \sin (\frac{2 t}{π})) - 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4.2

Apply the distributive property.

$\frac{5 (2 (- 2 \sin (\frac{2 t}{π}))) + 5 (\sin (\frac{2 t}{π}) (- 2 \sin (\frac{2 t}{π}))) + 5 (- 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4.3

Combine terms.

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Step 4.3.1

Multiply $- 2$ by $2$ .

$\frac{5 (- 4 \sin (\frac{2 t}{π})) + 5 (\sin (\frac{2 t}{π}) (- 2 \sin (\frac{2 t}{π}))) + 5 (- 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4.3.2

Multiply $- 4$ by $5$ .

$\frac{- 20 \sin (\frac{2 t}{π}) + 5 (\sin (\frac{2 t}{π}) (- 2 \sin (\frac{2 t}{π}))) + 5 (- 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4.3.3

Raise $\sin (\frac{2 t}{π})$ to the power of $1$ .

$\frac{- 20 \sin (\frac{2 t}{π}) + 5 (- 2 (\sin^{1} (\frac{2 t}{π}) \sin (\frac{2 t}{π}))) + 5 (- 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4.3.4

Raise $\sin (\frac{2 t}{π})$ to the power of $1$ .

$\frac{- 20 \sin (\frac{2 t}{π}) + 5 (- 2 (\sin^{1} (\frac{2 t}{π}) \sin^{1} (\frac{2 t}{π}))) + 5 (- 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4.3.5

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

$\frac{- 20 \sin (\frac{2 t}{π}) + 5 (- 2 {\sin (\frac{2 t}{π})}^{1 + 1}) + 5 (- 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4.3.6

Add $1$ and $1$ .

$\frac{- 20 \sin (\frac{2 t}{π}) + 5 (- 2 \sin^{2} (\frac{2 t}{π})) + 5 (- 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4.3.7

Multiply $- 2$ by $5$ .

$\frac{- 20 \sin (\frac{2 t}{π}) - 10 \sin^{2} (\frac{2 t}{π}) + 5 (- 2 \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4.3.8

Multiply $- 2$ by $5$ .

$\frac{- 20 \sin (\frac{2 t}{π}) - 10 \sin^{2} (\frac{2 t}{π}) - 10 \cos^{2} (\frac{2 t}{π})}{π {(2 + \sin (\frac{2 t}{π}))}^{2}} + 0$

Step 4.3.9

Add $\frac{- 20 \sin (\frac{2 t}{π}) - 10 \sin^{2} (\frac{2 t}{π}) - 10 \cos^{2} (\frac{2 t}{π})}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$ and $0$ .

$\frac{- 20 \sin (\frac{2 t}{π}) - 10 \sin^{2} (\frac{2 t}{π}) - 10 \cos^{2} (\frac{2 t}{π})}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$

Step 4.4

Factor $- 10$ out of $- 10 \sin^{2} (\frac{2 t}{π})$ .

$\frac{- 20 \sin (\frac{2 t}{π}) - 10 (\sin^{2} (\frac{2 t}{π})) - 10 \cos^{2} (\frac{2 t}{π})}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$

Step 4.5

Factor $- 10$ out of $- 10 \cos^{2} (\frac{2 t}{π})$ .

$\frac{- 20 \sin (\frac{2 t}{π}) - 10 (\sin^{2} (\frac{2 t}{π})) - 10 (\cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$

Step 4.6

Factor $- 10$ out of $- 10 (\sin^{2} (\frac{2 t}{π})) - 10 (\cos^{2} (\frac{2 t}{π}))$ .

$\frac{- 20 \sin (\frac{2 t}{π}) - 10 (\sin^{2} (\frac{2 t}{π}) + \cos^{2} (\frac{2 t}{π}))}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$

Step 4.7

Apply pythagorean identity.

$\frac{- 20 \sin (\frac{2 t}{π}) - 10 \cdot 1}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$

Step 4.8

Factor $- 10$ out of $- 20 \sin (\frac{2 t}{π}) - 10 \cdot 1$ .

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Step 4.8.1

Factor $- 10$ out of $- 20 \sin (\frac{2 t}{π})$ .

$\frac{- 10 (2 \sin (\frac{2 t}{π})) - 10 \cdot 1}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$

Step 4.8.2

Factor $- 10$ out of $- 10 \cdot 1$ .

$\frac{- 10 (2 \sin (\frac{2 t}{π})) - 10 (1)}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$

Step 4.8.3

Factor $- 10$ out of $- 10 (2 \sin (\frac{2 t}{π})) - 10 (1)$ .

$\frac{- 10 (2 \sin (\frac{2 t}{π}) + 1)}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$

Step 4.9

Move the negative in front of the fraction.

$- \frac{10 (2 \sin (\frac{2 t}{π}) + 1)}{π {(2 + \sin (\frac{2 t}{π}))}^{2}}$