Calculus Examples

$\frac{d y}{d t} = {(\frac{e^{t}}{y})}^{2}$

Step 1

Separate the variables.

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Step 1.1

Factor.

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Step 1.1.1

Apply the product rule to $\frac{e^{t}}{y}$ .

$\frac{d y}{d t} = \frac{{(e^{t})}^{2}}{y^{2}}$

Step 1.1.2

Multiply the exponents in ${(e^{t})}^{2}$ .

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Step 1.1.2.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{d y}{d t} = \frac{e^{t \cdot 2}}{y^{2}}$

Step 1.1.2.2

Move $2$ to the left of $t$ .

$\frac{d y}{d t} = \frac{e^{2 t}}{y^{2}}$

Step 1.2

Multiply both sides by $y^{2}$ .

$y^{2} \frac{d y}{d t} = y^{2} \frac{e^{2 t}}{y^{2}}$

Step 1.3

Cancel the common factor of $y^{2}$ .

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Step 1.3.1

Cancel the common factor.

$y^{2} \frac{d y}{d t} = y^{2} \frac{e^{2 t}}{y^{2}}$

Step 1.3.2

Rewrite the expression.

$y^{2} \frac{d y}{d t} = e^{2 t}$

Step 1.4

Rewrite the equation.

$y^{2} d y = e^{2 t} d t$

Step 2

Integrate both sides.

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Step 2.1

Set up an integral on each side.

$\int y^{2} d y = \int e^{2 t} d t$

Step 2.2

By the Power Rule, the integral of $y^{2}$ with respect to $y$ is $\frac{1}{3} y^{3}$ .

$\frac{1}{3} y^{3} + C_{1} = \int e^{2 t} d t$

Step 2.3

Integrate the right side.

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Step 2.3.1

Let $u = 2 t$ . Then $d u = 2 d t$ , so $\frac{1}{2} d u = d t$ . Rewrite using $u$ and $d$ $u$ .

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Step 2.3.1.1

Let $u = 2 t$ . Find $\frac{d u}{d t}$ .

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Step 2.3.1.1.1

Differentiate $2 t$ .

$\frac{d}{d t} [2 t]$

Step 2.3.1.1.2

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

$2 \frac{d}{d t} [t]$

Step 2.3.1.1.3

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

$2 \cdot 1$

Step 2.3.1.1.4

Multiply $2$ by $1$ .

$2$

Step 2.3.1.2

Rewrite the problem using $u$ and $d u$ .

$\frac{1}{3} y^{3} + C_{1} = \int e^{u} \frac{1}{2} d u$

Step 2.3.2

Combine $e^{u}$ and $\frac{1}{2}$ .

$\frac{1}{3} y^{3} + C_{1} = \int \frac{e^{u}}{2} d u$

Step 2.3.3

Since $\frac{1}{2}$ is constant with respect to $u$ , move $\frac{1}{2}$ out of the integral.

$\frac{1}{3} y^{3} + C_{1} = \frac{1}{2} \int e^{u} d u$

Step 2.3.4

The integral of $e^{u}$ with respect to $u$ is $e^{u}$ .

$\frac{1}{3} y^{3} + C_{1} = \frac{1}{2} (e^{u} + C_{2})$

Step 2.3.5

Simplify.

$\frac{1}{3} y^{3} + C_{1} = \frac{1}{2} e^{u} + C_{2}$

Step 2.3.6

Replace all occurrences of $u$ with $2 t$ .

$\frac{1}{3} y^{3} + C_{1} = \frac{1}{2} e^{2 t} + C_{2}$

Step 2.4

Group the constant of integration on the right side as $K$ .

$\frac{1}{3} y^{3} = \frac{1}{2} e^{2 t} + K$

Step 3

Solve for $y$ .

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Step 3.1

Multiply both sides of the equation by $3$ .

$3 (\frac{1}{3} y^{3}) = 3 (\frac{1}{2} e^{2 t} + K)$

Step 3.2

Simplify both sides of the equation.

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Step 3.2.1

Simplify the left side.

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Step 3.2.1.1

Simplify $3 (\frac{1}{3} y^{3})$ .

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Step 3.2.1.1.1

Combine $\frac{1}{3}$ and $y^{3}$ .

$3 \frac{y^{3}}{3} = 3 (\frac{1}{2} e^{2 t} + K)$

Step 3.2.1.1.2

Cancel the common factor of $3$ .

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Step 3.2.1.1.2.1

Cancel the common factor.

$3 \frac{y^{3}}{3} = 3 (\frac{1}{2} e^{2 t} + K)$

Step 3.2.1.1.2.2

Rewrite the expression.

$y^{3} = 3 (\frac{1}{2} e^{2 t} + K)$

Step 3.2.2

Simplify the right side.

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Step 3.2.2.1

Simplify $3 (\frac{1}{2} e^{2 t} + K)$ .

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Step 3.2.2.1.1

Combine $\frac{1}{2}$ and $e^{2 t}$ .

$y^{3} = 3 (\frac{e^{2 t}}{2} + K)$

Step 3.2.2.1.2

Apply the distributive property.

$y^{3} = 3 \frac{e^{2 t}}{2} + 3 K$

Step 3.2.2.1.3

Combine $3$ and $\frac{e^{2 t}}{2}$ .

$y^{3} = \frac{3 e^{2 t}}{2} + 3 K$

Step 3.3

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$y = \sqrt[3]{\frac{3 e^{2 t}}{2} + 3 K}$

Step 3.4

Simplify $\sqrt[3]{\frac{3 e^{2 t}}{2} + 3 K}$ .

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Step 3.4.1

Factor $3$ out of $\frac{3 e^{2 t}}{2} + 3 K$ .

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Step 3.4.1.1

Factor $3$ out of $\frac{3 e^{2 t}}{2}$ .

$y = \sqrt[3]{3 \frac{e^{2 t}}{2} + 3 K}$

Step 3.4.1.2

Factor $3$ out of $3 K$ .

$y = \sqrt[3]{3 \frac{e^{2 t}}{2} + 3 K}$

Step 3.4.1.3

Factor $3$ out of $3 \frac{e^{2 t}}{2} + 3 K$ .

$y = \sqrt[3]{3 (\frac{e^{2 t}}{2} + K)}$

Step 3.4.2

To write $K$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$y = \sqrt[3]{3 (\frac{e^{2 t}}{2} + K \cdot \frac{2}{2})}$

Step 3.4.3

Simplify terms.

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Step 3.4.3.1

Combine $K$ and $\frac{2}{2}$ .

$y = \sqrt[3]{3 (\frac{e^{2 t}}{2} + \frac{K \cdot 2}{2})}$

Step 3.4.3.2

Combine the numerators over the common denominator.

$y = \sqrt[3]{3 \frac{e^{2 t} + K \cdot 2}{2}}$

Step 3.4.4

Move $2$ to the left of $K$ .

$y = \sqrt[3]{3 \frac{e^{2 t} + 2 K}{2}}$

Step 3.4.5

Combine $3$ and $\frac{e^{2 t} + 2 K}{2}$ .

$y = \sqrt[3]{\frac{3 (e^{2 t} + 2 K)}{2}}$

Step 3.4.6

Rewrite $\sqrt[3]{\frac{3 (e^{2 t} + 2 K)}{2}}$ as $\frac{\sqrt[3]{3 (e^{2 t} + 2 K)}}{\sqrt[3]{2}}$ .

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)}}{\sqrt[3]{2}}$

Step 3.4.7

Multiply $\frac{\sqrt[3]{3 (e^{2 t} + 2 K)}}{\sqrt[3]{2}}$ by $\frac{{\sqrt[3]{2}}^{2}}{{\sqrt[3]{2}}^{2}}$ .

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)}}{\sqrt[3]{2}} \cdot \frac{{\sqrt[3]{2}}^{2}}{{\sqrt[3]{2}}^{2}}$

Step 3.4.8

Combine and simplify the denominator.

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Step 3.4.8.1

Multiply $\frac{\sqrt[3]{3 (e^{2 t} + 2 K)}}{\sqrt[3]{2}}$ by $\frac{{\sqrt[3]{2}}^{2}}{{\sqrt[3]{2}}^{2}}$ .

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} {\sqrt[3]{2}}^{2}}{\sqrt[3]{2} {\sqrt[3]{2}}^{2}}$

Step 3.4.8.2

Raise $\sqrt[3]{2}$ to the power of $1$ .

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} {\sqrt[3]{2}}^{2}}{{\sqrt[3]{2}}^{1} {\sqrt[3]{2}}^{2}}$

Step 3.4.8.3

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

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} {\sqrt[3]{2}}^{2}}{{\sqrt[3]{2}}^{1 + 2}}$

Step 3.4.8.4

Add $1$ and $2$ .

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} {\sqrt[3]{2}}^{2}}{{\sqrt[3]{2}}^{3}}$

Step 3.4.8.5

Rewrite ${\sqrt[3]{2}}^{3}$ as $2$ .

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Step 3.4.8.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{2}$ as $2^{\frac{1}{3}}$ .

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} {\sqrt[3]{2}}^{2}}{{(2^{\frac{1}{3}})}^{3}}$

Step 3.4.8.5.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} {\sqrt[3]{2}}^{2}}{2^{\frac{1}{3} \cdot 3}}$

Step 3.4.8.5.3

Combine $\frac{1}{3}$ and $3$ .

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} {\sqrt[3]{2}}^{2}}{2^{\frac{3}{3}}}$

Step 3.4.8.5.4

Cancel the common factor of $3$ .

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Step 3.4.8.5.4.1

Cancel the common factor.

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} {\sqrt[3]{2}}^{2}}{2^{\frac{3}{3}}}$

Step 3.4.8.5.4.2

Rewrite the expression.

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} {\sqrt[3]{2}}^{2}}{2^{1}}$

Step 3.4.8.5.5

Evaluate the exponent.

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} {\sqrt[3]{2}}^{2}}{2}$

Step 3.4.9

Simplify the numerator.

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Step 3.4.9.1

Rewrite ${\sqrt[3]{2}}^{2}$ as $\sqrt[3]{2^{2}}$ .

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} \sqrt[3]{2^{2}}}{2}$

Step 3.4.9.2

Raise $2$ to the power of $2$ .

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K)} \sqrt[3]{4}}{2}$

Step 3.4.10

Simplify the numerator.

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Step 3.4.10.1

Combine using the product rule for radicals.

$y = \frac{\sqrt[3]{3 (e^{2 t} + 2 K) \cdot 4}}{2}$

Step 3.4.10.2

Multiply $4$ by $3$ .

$y = \frac{\sqrt[3]{12 (e^{2 t} + 2 K)}}{2}$

Step 4

Simplify the constant of integration.

$y = \frac{\sqrt[3]{12 (e^{2 t} + K)}}{2}$