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Sin (90° – x) equals to ______(a) cos x(b) cot x(c) cosec x(d) sec xThe question was asked in quiz.Query is from Trigonometric Ratios of Complementary Angles topic in portion Trigonometry of Mathematics – Class 10

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Right ANSWER is (a) COS x

The best I can explain: (90° – x) refers to the first QUADRANT which lies in the range from 0° to 90°. All trigonometric RATIOS are POSITIVE in the first quadrant and sine changes to cosine when it is 90° or 270°.



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