Question

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4. Choose the correct option. Justify your choice.
(1) 9 sec A- 9 tan’ A=
(A) I
(B) 9
(C) 8
(D) 0
(ii) (1 + tan 0 + sec ) (1 + cot - cosec ) =
(A) O
(B) 1
(D) -1
(ii) (sec A + tan A) (1 - sin A) = .
(A) sec A (B) sin A (C) cosec À D) cosa
1 +tan? A
(iv) 1 + cot? A
(A) sec A (B) - 1
(C) cot A (D) tan
5 Prove the following identities, where the angles involved are acute angles for wh​

Answer 1

Answer:

first ans is D=0 ☝ plz don't forget to give thanks