Trigonometry Examples

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

Step 1

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

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

Step 2

The result can be shown in multiple forms.

Exact Form:

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

Decimal Form:

$0.76024459 \dots$