Choose the correct option. Justify your choice. 9 sec2A – 9 tan2A =? (A) 1 (B) 9 (C) 8 (D) 0

Answer: (B) 9

9 sec2A – 9 tan2A

Take 9 outside, and it becomes

= 9 (sec2A – tan2A)

∵ sec2 A – tan2 A = 1

= 9×1

= 9

Therefore, 9 sec2A – 9 tan2A = 9

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