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[" hacos "A+cos^(2)(A+120^(@))+cos^(2)(A...

[" hacos "A+cos^(2)(A+120^(@))+cos^(2)(A-120^(@))],[[" (B) "2," (C) "3/2," (D) "4]]

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cos (120^(@)) is -

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

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

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

cos120^(@)=

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

The minimum of cos^(2)(120^(@) + x)+ cos^(2) (120^(@) -x) is

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

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

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