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[" 18.In a "Delta ABC,r^(2)cot(A)/(2)cot...

[" 18.In a "Delta ABC,r^(2)cot(A)/(2)cot(B)/(2)cot(C)/(2)=],[" 1."Deltaquad " 2."2Deltaquad " 3."4Deltaquad " 4."(Delta)/(2)]

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