Question

Sin(A-B)=0;;
Cos(A+B)=0;;
Then ;; A=+________

Answer 1

sin( A - B ) = 0

Sin ( A - B ) = sin0

A - B = 0 -------------- (1)

Cos (A+B ) = 0

Cos (A + B) = Cos90

A+B = 90 -------------------(2)

adding eq. (1) and (2)

2A = 90

A = 45