Trigonometry Examples

$\cos (- \frac{6}{7})$

Step 1

Since $\cos (- \frac{6}{7})$ is an even function, rewrite $\cos (- \frac{6}{7})$ as $\cos (\frac{6}{7})$ .

$\cos (\frac{6}{7})$

Step 2

The result can be shown in multiple forms.

Exact Form:

$\cos (\frac{6}{7})$

Decimal Form:

$0.65460006 \dots$