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WAEC - Mathematics (1988 - No. 8)
If cos 60° = 1/2, which of the following angle has cosine of -1/2?
30
o
120
o
150
o
210
o
300
o
解释
cos 60° = 1/2, cos(180° - 60°) = -1/2
cos120° = -1/2
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