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cos ( -1500°) =______________(a) 1/2(b) -1/2(c) √3/2(d) -√3/2I have been asked this question during an interview.This is a very interesting question from Trigonometric Functions topic in chapter Trigonometric Functions of Mathematics – Class 11

Answer»

The CORRECT ANSWER is (a) 1/2

Explanation: COS(-1500°) = cos(1500°) {cos(-X) = cos x}

= cos (4*360° + 60°) = cos 60° = 1/2. {cos (2nπ+x) = cos x}



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