Question

9 sec² A − 9 tan² A is equal to

Options

• 1

• 9

• 8

• 0

Answer 1

Given:

`9 sec^2 A-9 tan^2 A`

`=9 (sec^2 A-tan^2 A)`

We know that, `sec^2 A-tan^2 A=1`

Therefore, `9 sec^2 A-9 tan^2 A=9`