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[" Prove that: "],[qquad cos^(2)A+cos^(2...

[" Prove that: "],[qquad cos^(2)A+cos^(2)(A+120^(@))+cos^(2)(A-120^(@))=(3)/(2)]

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

cos^(2) A + cos^(2) ( 120^(@) + A)+ cos^(2) (120^(@) - A )=

cos^(2)alpha+cos^(2)(alpha+120^(@))+cos^(2)(alpha-120^(@))=(3)/(2)

cos120^(@)=

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

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

cos^(2)alpha+cos^(2)(alpha+120^(@))+cos^(2)(alpha-120^(@))=?

cos (120^(@)) is -

cosA+cos(120^(@)-A)+cos(120^(@)+A)=0

cosA+cos(120^(@)-A)+cos(120^(@)+A)=0