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xvi)cos^(2)x+cos^(2)(x+120^(@))+cos^(2)(...

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

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

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