NCERT Exercise 8.3 - Q4(viii) - Introduction to Trigonometry
Question: Prove the following identities, where the angles involved are acute angles for which the expressions are defined. (viii) (sin A + cosec A)^2 + (cos A + sec A)^2 = 7 + tan^2 A + cot^2 A
Answer: (sin A + cosec A)^2 + (cos A + sec A)^2 = 7 + tan^2 A + cot^2 A.
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