sin(a-3π/2) * cos(π-a)
sin(a-3π/2) = sin(a)cos(π-a) = -cos(a)
Therefore, the expression simplifies to:
sin(a) (-cos(a))= -sin(a) cos(a)= -sin(a)cos(a)
sin(a-3π/2) * cos(π-a)
sin(a-3π/2) = sin(a)
cos(π-a) = -cos(a)
Therefore, the expression simplifies to:
sin(a) (-cos(a))
= -sin(a) cos(a)
= -sin(a)cos(a)