Prove that cos^3A+cos^3(120^0+A)+cos^3(2...

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

Prove that cos^3A+cos^3(120^0+A)+cos^3(240^0+A)=3/4cos3A
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The value of the expression cos^(3)theta+cos^(3)(120+theta)+cos^(3)(24...
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Prove that cos^3A+cos^3(120^0+A)+cos^3(240^0+A)=3/4cos3A
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cos^3 A + cos^3 (120+A) + cos^3 (240+A) = 3/4 Cos 3A
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सिध्द कीजिए कि : cos^(3) theta+ cos^(3) (120^(@)+ theta) + cos^(3) ...
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सिध्द कीजिए कि: cos 120 ^(@) cos 240^(@) - sin 120^(@) sin 240^(@...
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सिद्ध कीजिए कि cos A + cos ( 120^(@) + A) + cos ( 120^(@) - A) = ...
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A : cos^(3) x + cos^(3)(120^@ + x) + cos^(3)(120^(@) - x)=(3)/(4) cos...
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सिद्ध कीजिए की cos A + cos( 120 ^(@) +A) +cos ( 120^(@) -A) =0
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