Calculus Examples

$y = \ln (\arctan (6 x^{5}))$

Step 1

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \ln (x)$ and $g (x) = \arctan (6 x^{5})$ .

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Step 1.1

To apply the Chain Rule, set $u_{1}$ as $\arctan (6 x^{5})$ .

$\frac{d}{d u_{1}} [\ln (u_{1})] \frac{d}{d x} [\arctan (6 x^{5})]$

Step 1.2

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

$\frac{1}{u_{1}} \frac{d}{d x} [\arctan (6 x^{5})]$

Step 1.3

Replace all occurrences of $u_{1}$ with $\arctan (6 x^{5})$ .

$\frac{1}{\arctan (6 x^{5})} \frac{d}{d x} [\arctan (6 x^{5})]$

Step 2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \arctan (x)$ and $g (x) = 6 x^{5}$ .

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Step 2.1

To apply the Chain Rule, set $u_{2}$ as $6 x^{5}$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{d}{d u_{2}} [\arctan (u_{2})] \frac{d}{d x} [6 x^{5}])$

Step 2.2

The derivative of $\arctan (u_{2})$ with respect to $u_{2}$ is $\frac{1}{1 + {u_{2}}^{2}}$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{1}{1 + {u_{2}}^{2}} \frac{d}{d x} [6 x^{5}])$

Step 2.3

Replace all occurrences of $u_{2}$ with $6 x^{5}$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{1}{1 + {(6 x^{5})}^{2}} \frac{d}{d x} [6 x^{5}])$

Step 3

Differentiate.

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Step 3.1

Factor $6$ out of $6 x^{5}$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{1}{1 + {(6 (x^{5}))}^{2}} \frac{d}{d x} [6 x^{5}])$

Step 3.2

Simplify the expression.

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Step 3.2.1

Apply the product rule to $6 (x^{5})$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{1}{1 + 6^{2} {(x^{5})}^{2}} \frac{d}{d x} [6 x^{5}])$

Step 3.2.2

Raise $6$ to the power of $2$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{1}{1 + 36 {(x^{5})}^{2}} \frac{d}{d x} [6 x^{5}])$

Step 3.2.3

Multiply the exponents in ${(x^{5})}^{2}$ .

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Step 3.2.3.1

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

$\frac{1}{\arctan (6 x^{5})} (\frac{1}{1 + 36 x^{5 \cdot 2}} \frac{d}{d x} [6 x^{5}])$

Step 3.2.3.2

Multiply $5$ by $2$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{1}{1 + 36 x^{10}} \frac{d}{d x} [6 x^{5}])$

Step 3.3

Since $6$ is constant with respect to $x$ , the derivative of $6 x^{5}$ with respect to $x$ is $6 \frac{d}{d x} [x^{5}]$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{1}{1 + 36 x^{10}} (6 \frac{d}{d x} [x^{5}]))$

Step 3.4

Combine $6$ and $\frac{1}{1 + 36 x^{10}}$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{6}{1 + 36 x^{10}} \frac{d}{d x} [x^{5}])$

Step 3.5

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 5$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{6}{1 + 36 x^{10}} (5 x^{4}))$

Step 3.6

Combine fractions.

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Step 3.6.1

Combine $5$ and $\frac{6}{1 + 36 x^{10}}$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{5 \cdot 6}{1 + 36 x^{10}} x^{4})$

Step 3.6.2

Multiply $5$ by $6$ .

$\frac{1}{\arctan (6 x^{5})} (\frac{30}{1 + 36 x^{10}} x^{4})$

Step 3.6.3

Combine $\frac{30}{1 + 36 x^{10}}$ and $x^{4}$ .

$\frac{1}{\arctan (6 x^{5})} \cdot \frac{30 x^{4}}{1 + 36 x^{10}}$

Step 3.6.4

Reorder terms.

$\frac{1}{\arctan (6 x^{5})} \cdot \frac{30 x^{4}}{36 x^{10} + 1}$

Step 3.6.5

Multiply $\frac{1}{\arctan (6 x^{5})}$ by $\frac{30 x^{4}}{36 x^{10} + 1}$ .

$\frac{30 x^{4}}{\arctan (6 x^{5}) (36 x^{10} + 1)}$