Question

Which of following equations are identities. Check all that apply.

A. sec x = 1/csc x

B. csc x = 1/sin x

C. tan x = cos x/sin x

D. cot x = 1/tan x

Answer 1

B and D are identical equations

Answer 2

The Sine, Cosine and Tangent are the main functions used in trigonometry and are based on a Right-Angled Triangle. Their opposites are cosecant, secant and cotangent.      

Hence,options B. csc x = 1/sin x and D. cot x = 1/tan x are the correct options.

Cosecant = 1/sine x and cotangent = 1/tangent x