Question

- If cos a = 0 then sin (a - b) can be reduced to :
(A) cos B
(B) cos 2B
(C) sina
(D) sin 2a
[CBSE-20​

Answer 1

Answer:

A) CosB

Step-by-step explanation:

CosA = 0

=> A = 90°

Sin(A-B) = SinACosB - CosASinB

             = SIn90°CosB - Cos90°SinB

             = CosB

Answer 2

A)cosbB

step_by_stepexpkanation. cosA__0. __A_90. sin(a-b-sinacosb-cosasinb-sln90cosBA)cosB•