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cos^3(x-((2pi)/3))+cos^3x+cos^3(x+((2pi)...

`cos^3(x-((2pi)/3))+cos^3x+cos^3(x+((2pi)/3)))=3/4 cos3x`

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Prove that cos ^(3) (x-(2pi)/(3)) + cos ^(3) x + cos ^(3) (x + (2pi)/(3)) = (3)/(4) cos 3x.

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