Give me the best solution of ncert class 10 of introduction of trigonometry .Please solve this optional question of exercise 8.4 question no.4(1) of chapter trigonometry .Choose the correct option. Justify your choice. (i) 9 sec2A – 9 tan2A = (A) 1 (B) 9 (C) 8 (D) 0 .
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Choose the correct option. Justify your choice. (i) 9 sec2A – 9 tan2A = (A) 1 (B) 9 (C) 8 (D) 0 . Q.4(1)
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(B) is correct.
Justification:
Take 9 outside, and it becomes
9 sec2A – 9 tan2A
= 9 (sec2A – tan2A)
= 9×1 = 9 (∵ sec2 A – tan2 A = 1)
Therefore, 9 sec2A – 9 tan2A = 9