Calculus Examples

$\frac{3^{x}}{\log_{3} (x)}$

Step 1

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = 3^{x}$ and $g (x) = \log_{3} (x)$ .

$\frac{\log_{3} (x) \frac{d}{d x} [3^{x}] - 3^{x} \frac{d}{d x} [\log_{3} (x)]}{{\log_{3}}^{2} (x)}$

Step 2

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $3$ .

$\frac{\log_{3} (x) (3^{x} \ln (3)) - 3^{x} \frac{d}{d x} [\log_{3} (x)]}{{\log_{3}}^{2} (x)}$

Step 3

The derivative of $\log_{3} (x)$ with respect to $x$ is $\frac{1}{x \ln (3)}$ .

$\frac{\log_{3} (x) (3^{x} \ln (3)) - 3^{x} \frac{1}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 4

Combine $\frac{1}{x \ln (3)}$ and $3^{x}$ .

$\frac{\log_{3} (x) (3^{x} \ln (3)) - \frac{3^{x}}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5

Simplify.

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Step 5.1

Simplify the numerator.

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Step 5.1.1

Rewrite using the commutative property of multiplication.

$\frac{\ln (3) \log_{3} (x) \cdot 3^{x} - \frac{3^{x}}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5.1.2

Reorder factors in $\ln (3) \log_{3} (x) \cdot 3^{x} - \frac{3^{x}}{x \ln (3)}$ .

$\frac{3^{x} \ln (3) \log_{3} (x) - \frac{3^{x}}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5.2

Simplify the numerator.

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Step 5.2.1

Factor $3^{x}$ out of $3^{x} \ln (3) \log_{3} (x) - \frac{3^{x}}{x \ln (3)}$ .

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Step 5.2.1.1

Factor $3^{x}$ out of $3^{x} \ln (3) \log_{3} (x)$ .

$\frac{3^{x} (\ln (3) \log_{3} (x)) - \frac{3^{x}}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5.2.1.2

Factor $3^{x}$ out of $- \frac{3^{x}}{x \ln (3)}$ .

$\frac{3^{x} (\ln (3) \log_{3} (x)) + 3^{x} (- \frac{1}{x \ln (3)})}{{\log_{3}}^{2} (x)}$

Step 5.2.1.3

Factor $3^{x}$ out of $3^{x} (\ln (3) \log_{3} (x)) + 3^{x} (- \frac{1}{x \ln (3)})$ .

$\frac{3^{x} (\ln (3) \log_{3} (x) - \frac{1}{x \ln (3)})}{{\log_{3}}^{2} (x)}$

Step 5.2.2

To write $\ln (3) \log_{3} (x)$ as a fraction with a common denominator, multiply by $\frac{x \ln (3)}{x \ln (3)}$ .

$\frac{3^{x} (\ln (3) \log_{3} (x) \cdot \frac{x \ln (3)}{x \ln (3)} - \frac{1}{x \ln (3)})}{{\log_{3}}^{2} (x)}$

Step 5.2.3

Combine $\ln (3) \log_{3} (x)$ and $\frac{x \ln (3)}{x \ln (3)}$ .

$\frac{3^{x} (\frac{\ln (3) \log_{3} (x) (x \ln (3))}{x \ln (3)} - \frac{1}{x \ln (3)})}{{\log_{3}}^{2} (x)}$

Step 5.2.4

Combine the numerators over the common denominator.

$\frac{3^{x} \frac{\ln (3) \log_{3} (x) (x \ln (3)) - 1}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5.2.5

Simplify the numerator.

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Step 5.2.5.1

Multiply $\ln (3) \log_{3} (x) (x \ln (3))$ .

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Step 5.2.5.1.1

Raise $\ln (3)$ to the power of $1$ .

$\frac{3^{x} \frac{\log_{3} (x) (x (\ln^{1} (3) \ln (3))) - 1}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5.2.5.1.2

Raise $\ln (3)$ to the power of $1$ .

$\frac{3^{x} \frac{\log_{3} (x) (x (\ln^{1} (3) \ln^{1} (3))) - 1}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5.2.5.1.3

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

$\frac{3^{x} \frac{\log_{3} (x) (x {\ln (3)}^{1 + 1}) - 1}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5.2.5.1.4

Add $1$ and $1$ .

$\frac{3^{x} \frac{\log_{3} (x) (x \ln^{2} (3)) - 1}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5.2.5.2

Rewrite using the commutative property of multiplication.

$\frac{3^{x} \frac{\ln^{2} (3) \log_{3} (x) x - 1}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5.3

Combine $3^{x}$ and $\frac{\ln^{2} (3) \log_{3} (x) x - 1}{x \ln (3)}$ .

$\frac{\frac{3^{x} (\ln^{2} (3) \log_{3} (x) x - 1)}{x \ln (3)}}{{\log_{3}}^{2} (x)}$

Step 5.4

Multiply the numerator by the reciprocal of the denominator.

$\frac{3^{x} (\ln^{2} (3) \log_{3} (x) x - 1)}{x \ln (3)} \cdot \frac{1}{{\log_{3}}^{2} (x)}$

Step 5.5

Combine.

$\frac{3^{x} (\ln^{2} (3) \log_{3} (x) x - 1) \cdot 1}{x \ln (3) {\log_{3}}^{2} (x)}$

Step 5.6

Multiply $3^{x}$ by $1$ .

$\frac{3^{x} (\ln^{2} (3) \log_{3} (x) x - 1)}{x \ln (3) {\log_{3}}^{2} (x)}$

Step 5.7

Reorder factors in $\frac{3^{x} (\ln^{2} (3) \log_{3} (x) x - 1)}{x \ln (3) {\log_{3}}^{2} (x)}$ .

$\frac{3^{x} (x \ln^{2} (3) \log_{3} (x) - 1)}{x \ln (3) {\log_{3}}^{2} (x)}$