Precalculus Examples

$1 - 2 \sin^{2} (\frac{3}{5})$

Step 1

Apply the cosine double-angle identity.

$\cos (2 (\frac{3}{5}))$

Step 2

Multiply $2 (\frac{3}{5})$ .

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Step 2.1

Combine $2$ and $\frac{3}{5}$ .

$\cos (\frac{2 \cdot 3}{5})$

Step 2.2

Multiply $2$ by $3$ .

$\cos (\frac{6}{5})$

$\cos (\frac{6}{5})$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\cos (\frac{6}{5})$

Decimal Form:

$0.36235775 \dots$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$