Evaluating using Trignometric Identities
Last updated at April 16, 2024 by Teachoo
Ex 8.3, 3 Choose the correct option. Justify your choice. (i) 9 sec2 A – 9 tan2 A 1 (B) 9 (C) 8 (D) 0 9 sec2 A – 9 tan2 A As sec2 A = 1 + tan2 A = 9 (1 + tan2 A) – 9 tan2 A = 9 + 9 tan2 A – 9 tan2 A = 9 + 0 = 9 So, the correct answer is (b)