Given that (sin x = frac{-sqrt{3}}{2}) and (cos x > 0), find x.
-
A.
300° -
B.
240° -
C.
120° -
D.
60°
Correct Answer: Option A
Explanation
In order to do this, simply find the option in the range where only the cos is +ve. This occurs in the range (270° leq x leq 360°).
Check: (sin 300 = – sin 60 = frac{-sqrt{3}}{2})
(cos 300 = cos 60 = frac{1}{2})