Question

any body can tell me how to apply trigonometric identities on question​

Answer 1

Step-by-step explanation:

Angle Sum and Difference Identities

Note that means you can use plus or minus, and the. means to use the opposite sign.

sin(A B) = sin(A)cos(B) cos(A)sin(B)

cos(A B) = cos(A)cos(B) sin(A)sin(B)

tan(A B) = tan(A) tan(B)1 tan(A)tan(B)

cot(A B) = cot(A)cot(B) 1cot(B) cot(A)