Question

sin(∏ - α) + sin(∏ + α) - cos(3∏/2 + α) + sinα = 0

Answer 1

Sin(π-a)= sin(a),

sin(π+a)= -sin(a),

cos(3π/2+a) = -cos(π/2+a) = sin(a)

sin(a)-sin(a)-sin(a)+sin(a)=0