Cot 405° equals to _____ A. cosec 15° B. sec 15° C. 1 D. 0 The

cot-405deg-equals-to-a-cosec-15deg-b-sec-15deg-c-1-d-0-the

Cot 405° equals to _____

A. cosec 15°

B. sec 15°

C. 1

D. 0

The question was asked in exam.

This question is from Trigonometric Ratios of Complementary Angles in portion Trigonometry of Mathematics – Class 10

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