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