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9,sin^(3)x+sin^(3)((2 pi)/(3)+x)+sin^(3)...

9,sin^(3)x+sin^(3)((2 pi)/(3)+x)+sin^(3)((4 pi)/(3)+x)=-(3)/(4)sin3x

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Prove that: sin^(3)A+sin^(3)((2 pi)/(3)+A)+sin^(3)((4 pi)/(3)+A)=-(3)/(4)sin3A

Prove that, sin^(3)A+sin^(3)((2pi)/(3)+A)+sin^(3)((4pi)/(3)+A)=-(3)/(4)sin3A

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If f(x)=sin^(2)x+sin^(2)(x+(2pi)/(3))+sin^(2)(x+(4pi)/(3)) then :

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