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Is sin (90°+x) = cos x.(a) True(b) FalseI had been asked this question during an interview.I'd like to ask this question from Trigonometric Functions of Sum and Difference of Two Angles-1 in chapter Trigonometric Functions of Mathematics – Class 11

Answer»

The CORRECT ANSWER is (a) True

Explanation: sin (90°+x) = sin 90° COS x + cos 90° sin x {sin(x + y)=sin x cos y + cos x sin y}

= 1*cos x + 0*sin x

= cos x.



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