If cos 60° = 1/2, which of the following angle h...
If cos 60° = 1/2, which of the following angle has cosine of -1/2?
30o
120o
150o
210o
300o
Correct answer is B
cos 60° = 1/2, cos(180° - 60°) = -1/2
cos120° = -1/2
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