The value of (\cos , 12^{\circ} + \cos , 84^{\circ} + \cos ,... | Mathematics | SolveeIt | Solveeit

Today, August 18

Question

The value of $\cos \, 12^{\circ} + \cos \, 84^{\circ} + \cos \, 156^{\circ} + \cos \, 132^{\circ}$ is

A

$\frac{1}{2}$

B

1

C

$- \frac{1}{2}$

D

$\frac{1}{8}$

Answer

$- \frac{1}{2}$

Explanation

Solution

Answer (c) $- \frac{1}{2}$