Question

find the value cos 156°+cos 84° + cos 36°

Answer 1

The answer of cos 156 + cos 84 + cos 36 = 3.7 x 10^-16.

Answer 2

Cos 156 = 0.47

Cos 84 = - 0.68

Cos 36 = - 0.12

= 0.47 - 0.68 - 0.12

= - 0.33

Hope it helps!