5cosx -2sin(x/2) +7=0
me to find x step by step
pls

x = 180

Step-by-step explanation:

First, you need to know

1. Double-angle formula:

cos(2x) =

2. Pythagorean identity:

Back to your problem, replacing the variable by the above:

By Double-angle formula

By Pythagorean identity

Given

, we know -1 < sinx < 1, for every x ∈ R