NCERT Exercise 8.3 - Q4(x) - Introduction to Trigonometry
Question: Prove the following identities, where the angles involved are acute angles for which the expressions are defined. (x) (1 + tan^2 A)/(1 + cot^2 A) = ((1 — tan A)/(1 − cot A))^2
Answer: (1 + tan^2 A)/(1 + cot^2 A) = ((1 - tan A)/(1 - cot A))^2.
Full step-by-step NCERT solution with diagrams on Something by Zero.