Trigonometry Examples

$\cos (660)$

Step 1

Remove full rotations of

$360$ ° until the angle is between

$0$ ° and

$360$ °.

$\cos (300)$

Step 2

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant.

$\cos (60)$

Step 3

The exact value of

$\cos (60)$ is

$\frac{1}{2}$ .

$\frac{1}{2}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$\frac{1}{2}$

Decimal Form:

$0.5$

$\cos (660)$

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