Precalculus Examples

$\cos (- \frac{1}{3})$

Step 1

Since $\cos (- \frac{1}{3})$ is an even function, rewrite $\cos (- \frac{1}{3})$ as $\cos (\frac{1}{3})$ .

$\cos (\frac{1}{3})$

Step 2

The result can be shown in multiple forms.

Exact Form:

$\cos (\frac{1}{3})$

Decimal Form:

$0.94495694 \dots$