2 sin(a-3п)-cos(-п/2+a)/5sin(a-п)

Question

2 sin(a-3п)-cos(-п/2+a)/5sin(a-п)

Answer 1

 =-2sin(π-α)-cos(α/2-α) /-5sin(π-α)=-2sinα-sinα /-5sinα=-3sinα/-5sinα=
=  -3/-5=0.6