Calculus Examples

$g (t) = \frac{e^{2 t}}{1 + e^{2 t}}$

Step 1

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 $f (t) = e^{2 t}$ and $g (t) = 1 + e^{2 t}$ .

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

Step 2

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

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Step 2.1

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

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

Step 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 $a$ = $e$ .

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

Step 2.3

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

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

Step 3

Differentiate.

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Step 3.1

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

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

Step 3.2

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

$\frac{(1 + e^{2 t}) e^{2 t} (2 \cdot 1) - e^{2 t} \frac{d}{d t} [1 + e^{2 t}]}{{(1 + e^{2 t})}^{2}}$

Step 3.3

Simplify the expression.

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Step 3.3.1

Multiply $2$ by $1$ .

$\frac{(1 + e^{2 t}) e^{2 t} \cdot 2 - e^{2 t} \frac{d}{d t} [1 + e^{2 t}]}{{(1 + e^{2 t})}^{2}}$

Step 3.3.2

Move $2$ to the left of $(1 + e^{2 t}) e^{2 t}$ .

$\frac{2 \cdot ((1 + e^{2 t}) e^{2 t}) - e^{2 t} \frac{d}{d t} [1 + e^{2 t}]}{{(1 + e^{2 t})}^{2}}$

Step 3.4

By the Sum Rule, the derivative of $1 + e^{2 t}$ with respect to $t$ is $\frac{d}{d t} [1] + \frac{d}{d t} [e^{2 t}]$ .

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

Step 3.5

Since $1$ is constant with respect to $t$ , the derivative of $1$ with respect to $t$ is $0$ .

$\frac{2 (1 + e^{2 t}) e^{2 t} - e^{2 t} (0 + \frac{d}{d t} [e^{2 t}])}{{(1 + e^{2 t})}^{2}}$

Step 3.6

Add $0$ and $\frac{d}{d t} [e^{2 t}]$ .

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

Step 4

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

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Step 4.1

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

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

Step 4.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{2}} [a^{u_{2}}]$ is $a^{u_{2}} \ln (a)$ where $a$ = $e$ .

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

Step 4.3

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

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

Step 5

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

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

Step 6

Add $2 t$ and $2 t$ .

$\frac{2 (1 + e^{2 t}) e^{2 t} - e^{4 t} \frac{d}{d t} [2 t]}{{(1 + e^{2 t})}^{2}}$

Step 7

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

$\frac{2 (1 + e^{2 t}) e^{2 t} - e^{4 t} (2 \frac{d}{d t} [t])}{{(1 + e^{2 t})}^{2}}$

Step 8

Multiply $2$ by $- 1$ .

$\frac{2 (1 + e^{2 t}) e^{2 t} - 2 e^{4 t} \frac{d}{d t} [t]}{{(1 + e^{2 t})}^{2}}$

Step 9

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

$\frac{2 (1 + e^{2 t}) e^{2 t} - 2 e^{4 t} \cdot 1}{{(1 + e^{2 t})}^{2}}$

Step 10

Multiply $- 2$ by $1$ .

$\frac{2 (1 + e^{2 t}) e^{2 t} - 2 e^{4 t}}{{(1 + e^{2 t})}^{2}}$

Step 11

Simplify.

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Step 11.1

Apply the distributive property.

$\frac{(2 \cdot 1 + 2 e^{2 t}) e^{2 t} - 2 e^{4 t}}{{(1 + e^{2 t})}^{2}}$

Step 11.2

Apply the distributive property.

$\frac{2 \cdot 1 e^{2 t} + 2 e^{2 t} e^{2 t} - 2 e^{4 t}}{{(1 + e^{2 t})}^{2}}$

Step 11.3

Simplify the numerator.

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Step 11.3.1

Simplify each term.

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Step 11.3.1.1

Multiply $2$ by $1$ .

$\frac{2 e^{2 t} + 2 e^{2 t} e^{2 t} - 2 e^{4 t}}{{(1 + e^{2 t})}^{2}}$

Step 11.3.1.2

Multiply $e^{2 t}$ by $e^{2 t}$ by adding the exponents.

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Step 11.3.1.2.1

Move $e^{2 t}$ .

$\frac{2 e^{2 t} + 2 (e^{2 t} e^{2 t}) - 2 e^{4 t}}{{(1 + e^{2 t})}^{2}}$

Step 11.3.1.2.2

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

$\frac{2 e^{2 t} + 2 e^{2 t + 2 t} - 2 e^{4 t}}{{(1 + e^{2 t})}^{2}}$

Step 11.3.1.2.3

Add $2 t$ and $2 t$ .

$\frac{2 e^{2 t} + 2 e^{4 t} - 2 e^{4 t}}{{(1 + e^{2 t})}^{2}}$

Step 11.3.2

Combine the opposite terms in $2 e^{2 t} + 2 e^{4 t} - 2 e^{4 t}$ .

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Step 11.3.2.1

Subtract $2 e^{4 t}$ from $2 e^{4 t}$ .

$\frac{2 e^{2 t} + 0}{{(1 + e^{2 t})}^{2}}$

Step 11.3.2.2

Add $2 e^{2 t}$ and $0$ .

$\frac{2 e^{2 t}}{{(1 + e^{2 t})}^{2}}$