First slide

Trignometry

Question

Find the value of $\cos 120 °$ .

Easy

A

$\frac{1}{2}$
B

$\frac{1}{\sqrt{3}}$
C

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

$- \frac{1}{2}$

Solution

$\cos 120 ° = \cos (180 ° - 60 °) = - \cos 60 ° = - \frac{1}{2}$

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