Establish the identity. tan v − 1 / tan v +1 = 1 − cot v / 1 + cot v

Question

Which of the following statements establishes the​ identity?

A. tan v - 1 / tan v + 1 = tan v - 1 / tan v + 1 x tan v + 1 / tan v + 1 = tan²v - 1 / (tan v + 1)² = 1 - cot v / 1 + cot v.

B. tan v - 1 / tan v + 1 = 1 / sec v - 1 / 1 / sec v + 1 = (1 / sec v - 1 ) x sec v / (1 / sec v + 1 ) x sec v = 1 - cot v / 1 + cot v.

C. tan v - 1 / tan v + 1 = 1 / cot v - 1 / 1 / cot v + 1 = (1 / cot v - 1) x cot v / (1 / cot v + 1) x cot v = 1 - cot v / 1 + cot v.

Answer 1