Precalculus Examples

$(\frac{5}{2}) (\sec^{2} (2 \sqrt{x}) + \ln (\cos (2 \sqrt{x})))$

Step 1

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

$\frac{5}{2} (\sec^{2} (2 \sqrt{x}) + \ln (\cos (2 x^{\frac{1}{2}})))$

Step 2

Simplify each term.

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Step 2.1

Rewrite $\sec (2 \sqrt{x})$ in terms of sines and cosines.

$\frac{5}{2} ({(\frac{1}{\cos (2 \sqrt{x})})}^{2} + \ln (\cos (2 x^{\frac{1}{2}})))$

Step 2.2

Apply the product rule to $\frac{1}{\cos (2 \sqrt{x})}$ .

$\frac{5}{2} (\frac{1^{2}}{\cos^{2} (2 \sqrt{x})} + \ln (\cos (2 x^{\frac{1}{2}})))$

Step 2.3

One to any power is one.

$\frac{5}{2} (\frac{1}{\cos^{2} (2 \sqrt{x})} + \ln (\cos (2 x^{\frac{1}{2}})))$

Step 3

Apply the distributive property.

$\frac{5}{2} \cdot \frac{1}{\cos^{2} (2 \sqrt{x})} + \frac{5}{2} \ln (\cos (2 x^{\frac{1}{2}}))$

Step 4

Combine.

$\frac{5 \cdot 1}{2 \cos^{2} (2 \sqrt{x})} + \frac{5}{2} \ln (\cos (2 x^{\frac{1}{2}}))$

Step 5

Combine $\frac{5}{2}$ and $\ln (\cos (2 x^{\frac{1}{2}}))$ .

$\frac{5 \cdot 1}{2 \cos^{2} (2 \sqrt{x})} + \frac{5 \ln (\cos (2 x^{\frac{1}{2}}))}{2}$

Step 6

Multiply $5$ by $1$ .

$\frac{5}{2 \cos^{2} (2 \sqrt{x})} + \frac{5 \ln (\cos (2 x^{\frac{1}{2}}))}{2}$

Step 7

Simplify each term.

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Step 7.1

Multiply by $1$ .

$\frac{5}{2 (\cos^{2} (2 \sqrt{x}) \cdot 1)} + \frac{5 \ln (\cos (2 x^{\frac{1}{2}}))}{2}$

Step 7.2

Separate fractions.

$\frac{5}{2 \cdot (1)} \cdot \frac{1}{\cos^{2} (2 \sqrt{x})} + \frac{5 \ln (\cos (2 x^{\frac{1}{2}}))}{2}$

Step 7.3

Convert from $\frac{1}{\cos^{2} (2 \sqrt{x})}$ to $\sec^{2} (2 \sqrt{x})$ .

$\frac{5}{2 \cdot (1)} \sec^{2} (2 \sqrt{x}) + \frac{5 \ln (\cos (2 x^{\frac{1}{2}}))}{2}$

Step 7.4

Multiply $2$ by $1$ .

$\frac{5}{2} \sec^{2} (2 \sqrt{x}) + \frac{5 \ln (\cos (2 x^{\frac{1}{2}}))}{2}$

Step 7.5

Combine $\frac{5}{2}$ and $\sec^{2} (2 \sqrt{x})$ .

$\frac{5 \sec^{2} (2 \sqrt{x})}{2} + \frac{5 \ln (\cos (2 x^{\frac{1}{2}}))}{2}$