Simplify sin(2x)cot(x)?

4 ----------- (3) ii) 2nd equation is: 2*cos²x + cos²(2x) = 1 Rearranging, 2*cos²x - 1 + cos²(2x) = 0 cos(2x) + cos²(2x) = 0 By multiple angle identity, cos(2x) = 2*cos²x - 1.

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