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Sec 75° equals to _____(a) cosec 15°(b) sec 15°(c) 1(d) 0I had been asked this question by my college professor while I was bunking the class.This is a very interesting question from Trigonometric Ratios of Complementary Angles topic in portion Trigonometry of Mathematics – Class 10

Answer» RIGHT answer is (a) COSEC 15°

Explanation: All trigonometric ratios are positive in the first QUADRANT and secant changes to COSECANT when it is 90° or 270°.

Sec 75° = Sec (90° – 15°)

= Cosec 15°


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