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cos (17π/3) =______________(a) 1/2(b) -1/2(c) √3/2(d) -√3/2This question was addressed to me in an interview for job.This key question is from Trigonometric Functions in chapter Trigonometric Functions of Mathematics – Class 11

Answer» RIGHT answer is (a) 1/2

Easiest explanation: COS (17π/3) = cos (2π*3 – π/3)

{cos (2nπ-x)=cos x}

= cos(π/3) = 1/2.


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