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Is cos (90° – x) = sin x.(a) True(b) FalseThe question was posed to me in quiz.The question is from Trigonometric Functions of Sum and Difference of Two Angles-1 in section Trigonometric Functions of Mathematics – Class 11

Answer» CORRECT option is (a) True

For EXPLANATION: cos (90° – X) = cos 90° cos x + sin 90° sin x {cos(x – y)=cos x cos y + sin x sin y}

= 0*cos x + 1*sin x

= sin x.


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