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[" Prove that "cos^(3)A+cos^(3)(120^(@)+...

[" Prove that "cos^(3)A+cos^(3)(120^(@)+A)+cos^(3)(240^(@)+A)=(3)/(4)cos3A],[" OR "]

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Prove that cos^(3)A+cos^(3)(120^(@)+A)+cos^(3)(240^(0)+A)=(3)/(4)cos3A

Prove that cos^3A+cos^3(120^@+A)+cos^3(240^@+A)=3/4cos3A

Prove that: cos^(3)A + cos^(3)((2pi)/(3)+A) + cos^(3)((4pi)/3+A) = 3/4 cos3A

Prove that cos^3A+cos^3(120^0+A)+cos^3(240^0+A)=3/4cos3A

Prove that : cos^(3)A cos3A+sin^(3)A sin3A=cos^(3)2A

Prove that cos ^(2) A + cos ^(2) (A + 120^(@)) + cos ^(2) (A -120^(@)) = (3)/(2)

cos^(3)A+cos^(120+A)+cos^(240+A)=(3)/(4)cos3A

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