Precalculus Examples

$\cos (\arccos (- \frac{1}{2}))$

Step 1

The functions cosine and arccosine are inverses.

$- \frac{1}{2}$

Step 2

The result can be shown in multiple forms.

Exact Form:

$- \frac{1}{2}$

Decimal Form:

$- 0.5$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$