First slide

Trignometry

Question

Find the value of $\cos (- 60 °)$ .

Easy

A

$\frac{1}{2}$
B

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

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

$- \frac{1}{2}$

Solution

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

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