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[cos((pi)/(6)+x)+cos((pi)/(4)-x)+cos((pi...

[cos((pi)/(6)+x)+cos((pi)/(4)-x)+cos((pi)/(3)-x)(2],[" 25.If tan "x+tan(x+(pi)/(3))+tan(x+(2 pi)/(3))=3" ,then prove that "(3tan x-tan^(3)x)/(1-3tan^(2)x)=1]

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