Trigonometry Examples

$\cos (- 750 + 60)$

Step 1

Add $- 750$ and $60$ .

$\cos (- 690)$

Step 2

Add full rotations of $360$ ° until the angle is between $0$ ° and $360$ °.

$\cos (30)$

Step 3

The exact value of $\cos (30)$ is $\frac{\sqrt{3}}{2}$ .

$\frac{\sqrt{3}}{2}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$\frac{\sqrt{3}}{2}$

Decimal Form:

$0.86602540 \dots$