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cos^(3)A+cos^(3)(120^(@)+A)+cos^(3)(240^...

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

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

4(cos^3 20^(@) + cos^(3) 40^(@))=

The minimum value of cos^(3) x+ cos^(3) (120^(@) + x) + cos^(3) (120^(@) -x) is

cos^(3)110^(@)+cos^(3)10^(@)+cos^(3)130^(@)=

cos^(3) 20^(@) + cos^(3) 100^(@) + cos^(3) 140^(@) =

cos^(3)10^(@)+cos^(3)110^(@)+cos^(3)130^(@)=?

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

4cos^(3)15^(@)-3cos15^(@)=