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Grade: 12

                        

9 sec^2 A - 9 tan^2 A = (A) 1 (B) 9 (C) 8 (D) 0 choose the best option amnd

one month ago

Answers : (1)

Anand Kumar Pandey
askIITians Faculty
1677 Points
							Dear Student

Option (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 = 1

Therefore,
9 sec2A - 9 tan2A = 9

Thanks

one month ago
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