Trigonometry Examples

cos (390)

$\cos (390)$

Step 1

Remove full rotations of

$360$ ° until the angle is between

$0$ ° and

$360$ °.

$\cos (30)$

Step 2

The exact value of

$\cos (30)$ is

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

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

Step 3

The result can be shown in multiple forms.

Exact Form:

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

Decimal Form:

$0.86602540 \dots$

$\cos (390)$

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