Precalculus Examples

$\cos (\frac{- \sqrt{3}}{2})$

Step 1

Move the negative in front of the fraction.

$\cos (- \frac{\sqrt{3}}{2})$

Step 2

Since $\cos (- \frac{\sqrt{3}}{2})$ is an even function, rewrite $\cos (- \frac{\sqrt{3}}{2})$ as $\cos (\frac{\sqrt{3}}{2})$ .

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

Step 3

The result can be shown in multiple forms.

Exact Form:

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

Decimal Form:

$0.64785934 \dots$