Sin(pi/3+a)-1/2sin a

Question

Sin(pi/3+a)-1/2sin a

Answer 1

Sin ( pi /3+α)-1/2sin α=sin pi /3×cosα +sin α×cospi /3-1/2sin α=√3/2×cosα+
+1/2sin α-1/2sin α=√3/2×cosα