1.

cos (-60°) = ________________(a) -√3/2(b) 1/2(c) √3/2(d) -1/2The question was asked in an interview for job.I'd like to ask this question from Trigonometric Functions in chapter Trigonometric Functions of Mathematics – Class 11

Answer» CORRECT option is (B) 1/2

The best explanation: We know, cos (-X) = cos x

So, cos(-60°) = cos 60°=1/2.


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