Trigonometry Examples

\cos (- 780)

$\cos (- 780)$

Step 1

Add full rotations of

360

$360$ ° until the angle is between

0

$0$ ° and

360

$360$ °.

\cos (300)

$\cos (300)$

Step 2

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

\cos (60)

$\cos (60)$

Step 3

The exact value of

\cos (60)

$\cos (60)$ is

\frac{1}{2}

$\frac{1}{2}$ .

\frac{1}{2}

$\frac{1}{2}$

Step 4

The result can be shown in multiple forms.

Exact Form:

\frac{1}{2}

$\frac{1}{2}$

Decimal Form:

0.5

$0.5$

\cos (- 780)

$\cos (- 780)$

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