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" Prove that "sin^(2)alpha+sin^(2)(120-a...

" Prove that "sin^(2)alpha+sin^(2)(120-alpha)+sin^(2)(120^(@)+alpha)=(3)/(2)

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Prove that sin^(3)alpha+sin^(3)(120^(@)+alpha)+sin^(3)(240^(@)+alpha)=-(3)/(4)sin3 alpha

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