Calculus Examples

$\frac{3 \ln (t)}{a t - b t^{2}}$

Step 1

Since $3$ is constant with respect to $t$ , the derivative of $\frac{3 \ln (t)}{a t - b t^{2}}$ with respect to $t$ is $3 \frac{d}{d t} [\frac{\ln (t)}{a t - b t^{2}}]$ .

$3 \frac{d}{d t} [\frac{\ln (t)}{a t - b t^{2}}]$

Step 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 $f (t) = \ln (t)$ and $g (t) = a t - b t^{2}$ .

$3 \frac{(a t - b t^{2}) \frac{d}{d t} [\ln (t)] - \ln (t) \frac{d}{d t} [a t - b t^{2}]}{{(a t - b t^{2})}^{2}}$

Step 3

The derivative of $\ln (t)$ with respect to $t$ is $\frac{1}{t}$ .

$3 \frac{(a t - b t^{2}) \frac{1}{t} - \ln (t) \frac{d}{d t} [a t - b t^{2}]}{{(a t - b t^{2})}^{2}}$

Step 4

Differentiate.

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Step 4.1

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

$3 \frac{(a t - b t^{2}) \frac{1}{t} - \ln (t) (\frac{d}{d t} [a t] + \frac{d}{d t} [- b t^{2}])}{{(a t - b t^{2})}^{2}}$

Step 4.2

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

$3 \frac{(a t - b t^{2}) \frac{1}{t} - \ln (t) (a \frac{d}{d t} [t] + \frac{d}{d t} [- b t^{2}])}{{(a t - b t^{2})}^{2}}$

Step 4.3

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

$3 \frac{(a t - b t^{2}) \frac{1}{t} - \ln (t) (a \cdot 1 + \frac{d}{d t} [- b t^{2}])}{{(a t - b t^{2})}^{2}}$

Step 4.4

Multiply $a$ by $1$ .

$3 \frac{(a t - b t^{2}) \frac{1}{t} - \ln (t) (a + \frac{d}{d t} [- b t^{2}])}{{(a t - b t^{2})}^{2}}$

Step 4.5

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

$3 \frac{(a t - b t^{2}) \frac{1}{t} - \ln (t) (a - b \frac{d}{d t} [t^{2}])}{{(a t - b t^{2})}^{2}}$

Step 4.6

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

$3 \frac{(a t - b t^{2}) \frac{1}{t} - \ln (t) (a - b (2 t))}{{(a t - b t^{2})}^{2}}$

Step 4.7

Combine fractions.

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Step 4.7.1

Multiply $2$ by $- 1$ .

$3 \frac{(a t - b t^{2}) \frac{1}{t} - \ln (t) (a - 2 b t)}{{(a t - b t^{2})}^{2}}$

Step 4.7.2

Combine $3$ and $\frac{(a t - b t^{2}) \frac{1}{t} - \ln (t) (a - 2 b t)}{{(a t - b t^{2})}^{2}}$ .

$\frac{3 ((a t - b t^{2}) \frac{1}{t} - \ln (t) (a - 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5

Simplify.

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Step 5.1

Apply the distributive property.

$\frac{3 (a t \frac{1}{t} - b t^{2} \frac{1}{t} - \ln (t) (a - 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.2

Apply the distributive property.

$\frac{3 (a t \frac{1}{t} - b t^{2} \frac{1}{t} - \ln (t) a - \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.3

Apply the distributive property.

$\frac{3 (a t \frac{1}{t}) + 3 (- b t^{2} \frac{1}{t}) + 3 (- \ln (t) a) + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4

Simplify the numerator.

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Step 5.4.1

Simplify each term.

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Step 5.4.1.1

Cancel the common factor of $t$ .

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Step 5.4.1.1.1

Factor $t$ out of $a t$ .

$\frac{3 (t a \frac{1}{t}) + 3 (- b t^{2} \frac{1}{t}) + 3 (- \ln (t) a) + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.1.2

Cancel the common factor.

$\frac{3 (t a \frac{1}{t}) + 3 (- b t^{2} \frac{1}{t}) + 3 (- \ln (t) a) + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.1.3

Rewrite the expression.

$\frac{3 a + 3 (- b t^{2} \frac{1}{t}) + 3 (- \ln (t) a) + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.2

Cancel the common factor of $t$ .

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Step 5.4.1.2.1

Factor $t$ out of $- b t^{2}$ .

$\frac{3 a + 3 (t (- b t) \frac{1}{t}) + 3 (- \ln (t) a) + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.2.2

Cancel the common factor.

$\frac{3 a + 3 (t (- b t) \frac{1}{t}) + 3 (- \ln (t) a) + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.2.3

Rewrite the expression.

$\frac{3 a + 3 (- b t) + 3 (- \ln (t) a) + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.3

Multiply $- 1$ by $3$ .

$\frac{3 a - 3 (b t) + 3 (- \ln (t) a) + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.4

Multiply $3 (- \ln (t) a)$ .

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Step 5.4.1.4.1

Multiply $- 1$ by $3$ .

$\frac{3 a - 3 b t - 3 (\ln (t) a) + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.4.2

Reorder $\ln (t)$ and $- 3$ .

$\frac{3 a - 3 b t - 3 \cdot \ln (t) a + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.4.3

Simplify $- 3 \cdot \ln (t)$ by moving $3$ inside the logarithm.

$\frac{3 a - 3 b t - \ln (t^{3}) a + 3 (- \ln (t) (- 2 b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.5

Multiply $- \ln (t) (- 2 b t)$ .

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Step 5.4.1.5.1

Multiply $- 2$ by $- 1$ .

$\frac{3 a - 3 b t - \ln (t^{3}) a + 3 (2 \ln (t) (b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.5.2

Simplify $2 \ln (t)$ by moving $2$ inside the logarithm.

$\frac{3 a - 3 b t - \ln (t^{3}) a + 3 (\ln (t^{2}) (b t))}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.6

Multiply $3 (\ln (t^{2}) (b t))$ .

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Step 5.4.1.6.1

Reorder $\ln (t^{2})$ and $3$ .

$\frac{3 a - 3 b t - \ln (t^{3}) a + 3 \cdot \ln (t^{2}) (b t)}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.6.2

Simplify $3 \cdot \ln (t^{2})$ by moving $3$ inside the logarithm.

$\frac{3 a - 3 b t - \ln (t^{3}) a + \ln ({(t^{2})}^{3}) (b t)}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.7

Multiply the exponents in ${(t^{2})}^{3}$ .

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Step 5.4.1.7.1

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

$\frac{3 a - 3 b t - \ln (t^{3}) a + \ln (t^{2 \cdot 3}) (b t)}{{(a t - b t^{2})}^{2}}$

Step 5.4.1.7.2

Multiply $2$ by $3$ .

$\frac{3 a - 3 b t - \ln (t^{3}) a + \ln (t^{6}) (b t)}{{(a t - b t^{2})}^{2}}$

Step 5.4.2

Reorder factors in $3 a - 3 b t - \ln (t^{3}) a + \ln (t^{6}) (b t)$ .

$\frac{3 a - 3 b t - a \ln (t^{3}) + b t \ln (t^{6})}{{(a t - b t^{2})}^{2}}$

Step 5.5

Reorder terms.

$\frac{3 a - 3 b t - a \ln (t^{3}) + b t \ln (t^{6})}{{(a t - t^{2} b)}^{2}}$

Step 5.6

Simplify the denominator.

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Step 5.6.1

Factor $t$ out of $a t - t^{2} b$ .

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Step 5.6.1.1

Factor $t$ out of $a t$ .

$\frac{3 a - 3 b t - a \ln (t^{3}) + b t \ln (t^{6})}{{(t a - t^{2} b)}^{2}}$

Step 5.6.1.2

Factor $t$ out of $- t^{2} b$ .

$\frac{3 a - 3 b t - a \ln (t^{3}) + b t \ln (t^{6})}{{(t a + t (- t b))}^{2}}$

Step 5.6.1.3

Factor $t$ out of $t a + t (- t b)$ .

$\frac{3 a - 3 b t - a \ln (t^{3}) + b t \ln (t^{6})}{{(t (a - t b))}^{2}}$

Step 5.6.2

Apply the product rule to $t (a - t b)$ .

$\frac{3 a - 3 b t - a \ln (t^{3}) + b t \ln (t^{6})}{t^{2} {(a - t b)}^{2}}$