If cos 60° = 1/2, which of the following angle has cosine of -1/2?
-
A.
30o -
B.
120o -
C.
150o -
D.
210o -
E.
300o
Correct Answer: Option B
Explanation
cos 60° = 1/2, cos(180° – 60°) = -1/2
cos120° = -1/2
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