prove that sin^3x + sin^3(120°+x) + sin^3(240°+x) = -3sin3x/4
You asked:
Prove or disprove that the equation $\sin^{3}{\left(x \right)} + \sin^{3}{\left(120 ^\circ + x \right)} + \sin^{3}{\left(240 ^\circ + x \right)} = - \frac{3 \sin{\left(3 x \right)}}{4}$ is an identity.
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