1.

Cot 405° equals to _____(a) cosec 15°(b) sec 15°(c) 1(d) 0The question was asked in exam.This question is from Trigonometric Ratios of Complementary Angles in portion Trigonometry of Mathematics – Class 10

Answer»

The CORRECT choice is (c) 1

Explanation: All trigonometric RATIOS are positive in the FIRST quadrant.

So, Cot 405° = Cot (360° + 45°)

= Cot 45°

= 1



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