Precalculus Examples

$y = \arccos (- \frac{\sqrt{2}}{2})$

Step 1

The exact value of $\arccos (- \frac{\sqrt{2}}{2})$ is $\frac{3 π}{4}$ .

$y = \frac{3 π}{4}$

Step 2

The result can be shown in multiple forms.

Exact Form:

$y = \frac{3 π}{4}$

Decimal Form:

$y = 2.35619449 \dots$