Question

5sin(x+tan^-1(4/3))=3sinx+4cosx. proof?

Answer 1

5sin(x+tan^-1(4/3))=5sinx*cos(tan^-1(4/3))+5cosx*sin(tan^-1(4/3))
                              =5sinx*(3/5)+5cosx*(4/5)
                              =3sinx+4cosx