Trigonometry Examples

$\cot (870)$

Step 1

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

$\cot (150)$

Step 2

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cotangent is negative in the second quadrant.

$- \cot (30)$

Step 3

The exact value of $\cot (30)$ is $\sqrt{3}$ .

$- \sqrt{3}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$- \sqrt{3}$

Decimal Form:

$- 1.73205080 \dots$