No, for example if A = Pi/3. Then sin3A = sin pi = 0, but sinA =
sin Pi/3 = 1/2. So for A = Pi/3, the sum is 1/2, not zero. It can't
be proved because the statement is false. For example if A = Pi/3.
Then sin3A = sin pi = 0, but sinA = sin Pi/3 = 1/2. So for A =
Pi/3, the sum is 1/2, not zero.