Precalculus Examples

$9 \cos (45)$

Step 1

The exact value of $\cos (45)$ is $\frac{\sqrt{2}}{2}$ .

$9 \frac{\sqrt{2}}{2}$

Step 2

Combine $9$ and $\frac{\sqrt{2}}{2}$ .

$\frac{9 \sqrt{2}}{2}$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\frac{9 \sqrt{2}}{2}$

Decimal Form:

$6.36396103 \dots$