sin(60° + A) cos(30° - B) + cos(60° + A) sin(30° - B) is equal to
cos(A – B)
sin(A + B)
cos(A + B)
sin(A – B)
By using, sin(x + y) = sinx cosy + cosx siny
sin[ (60° + A) + (30° - B) ] = sin[90° + ( A - B)] = cos(A – B)
If mn=tanAtanB , find the value of m+nm−n