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" 26.Prove that "3" in "(pi)/(6)" yes "(...

" 26.Prove that "3" in "(pi)/(6)" yes "(pi)/(3)-tan(5 pi)/(6)cos(pi)/(4)=1

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" 1.Prove that : "sin^(2)(pi)/(6)+cos^(2)(pi)/(3)-tan^(2)(pi)/(4)=-(1)/(2)