Trigonometry Examples

$\cos (- \frac{20}{29})$

Step 1

Since $\cos (- \frac{20}{29})$ is an even function, rewrite $\cos (- \frac{20}{29})$ as $\cos (\frac{20}{29})$ .

$\cos (\frac{20}{29})$

Step 2

The result can be shown in multiple forms.

Exact Form:

$\cos (\frac{20}{29})$

Decimal Form:

$0.77146546 \dots$