2 sin(x) - 3 = 0
2 sin(x) = 3
sin(x) = 1.5
No solution. The maximum value of the sine function is 1.0 .
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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.
1.5
1/2 , 3/2
2x - 4x + 3 = 0 -2x + 3 = 0 2x = 3 x = 3/2 = 1.5