Calculus Examples

$\frac{d}{d x} (\frac{\ln (x)}{\sqrt{x}})$

Step 1

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

$\frac{d}{d x} [\frac{\ln (x)}{x^{\frac{1}{2}}}]$

Step 2

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 $f (x) = \ln (x)$ and $g (x) = x^{\frac{1}{2}}$ .

$\frac{x^{\frac{1}{2}} \frac{d}{d x} [\ln (x)] - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{{(x^{\frac{1}{2}})}^{2}}$

Step 3

Multiply the exponents in ${(x^{\frac{1}{2}})}^{2}$ .

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Step 3.1

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

$\frac{x^{\frac{1}{2}} \frac{d}{d x} [\ln (x)] - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x^{\frac{1}{2} \cdot 2}}$

Step 3.2

Cancel the common factor of $2$ .

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Step 3.2.1

Cancel the common factor.

$\frac{x^{\frac{1}{2}} \frac{d}{d x} [\ln (x)] - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x^{\frac{1}{2} \cdot 2}}$

Step 3.2.2

Rewrite the expression.

$\frac{x^{\frac{1}{2}} \frac{d}{d x} [\ln (x)] - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x^{1}}$

Step 4

Simplify.

$\frac{x^{\frac{1}{2}} \frac{d}{d x} [\ln (x)] - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$

Step 5

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

$\frac{x^{\frac{1}{2}} \frac{1}{x} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$

Step 6

Combine fractions.

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Step 6.1

Combine $x^{\frac{1}{2}}$ and $\frac{1}{x}$ .

$\frac{\frac{x^{\frac{1}{2}}}{x} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$

Step 6.2

Move $x^{\frac{1}{2}}$ to the denominator using the negative exponent rule $b^{n} = \frac{1}{b^{- n}}$ .

$\frac{\frac{1}{x \cdot x^{- \frac{1}{2}}} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$

Step 7

Multiply $x$ by $x^{- \frac{1}{2}}$ by adding the exponents.

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Step 7.1

Multiply $x$ by $x^{- \frac{1}{2}}$ .

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Step 7.1.1

Raise $x$ to the power of $1$ .

$\frac{\frac{1}{x^{1} x^{- \frac{1}{2}}} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$

Step 7.1.2

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

$\frac{\frac{1}{x^{1 - \frac{1}{2}}} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$

Step 7.2

Write $1$ as a fraction with a common denominator.

$\frac{\frac{1}{x^{\frac{2}{2} - \frac{1}{2}}} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$

Step 7.3

Combine the numerators over the common denominator.

$\frac{\frac{1}{x^{\frac{2 - 1}{2}}} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$

Step 7.4

Subtract $1$ from $2$ .

$\frac{\frac{1}{x^{\frac{1}{2}}} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$

Step 8

Multiply $\frac{\frac{1}{x^{\frac{1}{2}}} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$ by $\frac{x^{\frac{1}{2}}}{x^{\frac{1}{2}}}$ .

$\frac{x^{\frac{1}{2}}}{x^{\frac{1}{2}}} \cdot \frac{\frac{1}{x^{\frac{1}{2}}} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}]}{x}$

Step 9

Combine.

$\frac{x^{\frac{1}{2}} (\frac{1}{x^{\frac{1}{2}}} - \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}])}{x^{\frac{1}{2}} x}$

Step 10

Apply the distributive property.

$\frac{x^{\frac{1}{2}} \frac{1}{x^{\frac{1}{2}}} + x^{\frac{1}{2}} (- \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}])}{x^{\frac{1}{2}} x}$

Step 11

Cancel the common factor of $x^{\frac{1}{2}}$ .

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Step 11.1

Cancel the common factor.

$\frac{x^{\frac{1}{2}} \frac{1}{x^{\frac{1}{2}}} + x^{\frac{1}{2}} (- \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}])}{x^{\frac{1}{2}} x}$

Step 11.2

Rewrite the expression.

$\frac{1 + x^{\frac{1}{2}} (- \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}])}{x^{\frac{1}{2}} x}$

Step 12

Multiply $x^{\frac{1}{2}}$ by $x$ by adding the exponents.

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Step 12.1

Multiply $x^{\frac{1}{2}}$ by $x$ .

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Step 12.1.1

Raise $x$ to the power of $1$ .

$\frac{1 + x^{\frac{1}{2}} (- \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}])}{x^{\frac{1}{2}} x^{1}}$

Step 12.1.2

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

$\frac{1 + x^{\frac{1}{2}} (- \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}])}{x^{\frac{1}{2} + 1}}$

Step 12.2

Write $1$ as a fraction with a common denominator.

$\frac{1 + x^{\frac{1}{2}} (- \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}])}{x^{\frac{1}{2} + \frac{2}{2}}}$

Step 12.3

Combine the numerators over the common denominator.

$\frac{1 + x^{\frac{1}{2}} (- \ln (x) \frac{d}{d x} [x^{\frac{1}{2}}])}{x^{\frac{1 + 2}{2}}}$

Step 12.4

Add $1$ and $2$ .

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

Step 13

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

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

Step 14

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

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

Step 15

Combine $- 1$ and $\frac{2}{2}$ .

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

Step 16

Combine the numerators over the common denominator.

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

Step 17

Simplify the numerator.

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Step 17.1

Multiply $- 1$ by $2$ .

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

Step 17.2

Subtract $2$ from $1$ .

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

Step 18

Simplify terms.

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Step 18.1

Move the negative in front of the fraction.

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

Step 18.2

Combine $\frac{1}{2}$ and $x^{- \frac{1}{2}}$ .

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

Step 18.3

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

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

Step 18.4

Move $x^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

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

Step 18.5

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

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

Step 18.6

Cancel the common factor.

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

Step 18.7

Rewrite the expression.

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

Step 19

Simplify each term.

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Step 19.1

Rewrite $\frac{\ln (x)}{2}$ as $\frac{1}{2} \ln (x)$ .

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

Step 19.2

Simplify $\frac{1}{2} \ln (x)$ by moving $\frac{1}{2}$ inside the logarithm.

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