Algebra Examples

$\cos (\arccos (- \sqrt{5}))$

Step 1

The functions cosine and arccosine are inverses.

$- \sqrt{5}$

Step 2

The result can be shown in multiple forms.

Exact Form:

$- \sqrt{5}$

Decimal Form:

$- 2.23606797 \dots$

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