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