Answer:
The correct answer is Option d : 120°
Step-by-step explanation:
First we bring all the cos x terms to one side
2 = 5 + 6 cos x
Now we bring all the numerals to one side
-3 = 6 cos x
-[tex]\frac{1}{2}[/tex] = cos x
∵ cos 60° = [tex]\frac{1}{2}[/tex] ∴ cos x = cos 60°
x = 60°
Now just flip over for the negative to get 180-60 = 120
∴ The answer is 120°.
