Trigonometry Examples

$\cos (150)$

Step 1

The complement of $\cos (150)$ is the angle that when added to $\cos (150)$ forms a right angle ( $90 °$ ).

$90 ° - \cos (150)$

Step 2

Simplify each term.

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Step 2.1

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

Step 2.2

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

$90 + \frac{\sqrt{3}}{2 °}$

Step 2.3

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

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Step 2.3.1

Multiply $- 1$ by $- 1$ .

Step 2.3.2

Multiply $\frac{\sqrt{3}}{2}$ by $1$ .

$90 + \frac{\sqrt{3}}{2 °}$

Step 3

The result can be shown in multiple forms.

Exact Form:

$90 + \frac{\sqrt{3}}{2 °}$

Decimal Form:

$90.86602540 \dots$