Write all the other trigonometric ratios of ∠A in terms of sec A.

Choose the correct option. Justify your choice.

9 sec² A - 9 tan² A =

1. 1

2. 9

3. 8

4. 0

Choose the correct option. Justify your choice.

(sec A + tan A) (1 – sin A) =

1. sec A

2. sin A

3. cosec A

4. cos A