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9 sec^2 A - 9 tan^2 A = (A) 1 (B) 9 (C) 8 (D) 0 choose the best option amnd
Dear StudentOption (B) is correct.Justification:Take 9 outside,and it becomes 9 sec^2 A - 9 tan^2 A= 9 (sec^2 A - tan^2 A)=9∵sec^2 A - tan^2 A = 1Therefore,9 sec2A - 9 tan2A = 9Thanks
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