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

Correct option: (B) 9 Explanation: Take 9 outside, and it becomes 9 sec2A – 9 tan2A = 9 (sec2A – tan2A) = 9×1 = 9 (∵ sec2 A – tan2A = 1) Therefore, 9 sec2A – 9 tan2A = 9

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9 sec^2A – 9 tan^2A = (A) 1 (B) 9 (C) 8 (D) 0

Introduction to Trigonometry

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16/06/2021 10:58 am

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Satkriti Roao

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Choose the correct option. Justify your choice.

9 sec²A – 9 tan²A =

(A) 1

(B) 9

(D) 0

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16/06/2021 11:01 am

Samar shah

(@samar-shah)

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Correct option: (B) 9

Explanation:

Take 9 outside, and it becomes

9 sec²A – 9 tan²A

= 9 (sec²A – tan²A)

= 9×1 = 9 (∵ sec² A – tan²A = 1)

Therefore, 9 sec²A – 9 tan²A = 9

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