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sin3x+sinx-sin2x=2cos^2x-2cosx equation

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sin(3*x) + sin(x) - sin(2*x) = 2*cos (x) - 2*cos(x)
$$\left(\sin{\left(x \right)} + \sin{\left(3 x \right)}\right) - \sin{\left(2 x \right)} = 2 \cos^{2}{\left(x \right)} - 2 \cos{\left(x \right)}$$
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