Question

What is the product of cot 42° and tan 48°?

(a) Cot^2 42°

(b) Tan^2 42°

(c) 2Tan 16°

(d) 2Cot 16°

The question was asked in an online interview.

I need to ask this question from Trigonometric Ratios of Complementary Angles in division Trigonometry of Mathematics – Class 10

Answer 1

Right answer is (a) Cot^2 42°

Best explanation: (Cot 42°) (Tan 48°) = (Cot 42°) Tan (90° – 42°)

= Cot 42° Cot 42°

= Cot^2 42°