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[" APLE "18" If "a,b,c>0" and "s=(a+b+c)...

[" APLE "18" If "a,b,c>0" and "s=(a+b+c)/(2)," prove that "],[tan^(-1)sqrt((2as)/(bc))+tan^(-1)sqrt((2bs)/(ca))+tan^(-1)sqrt((2cs)/(ab))=pi],[" IrON We find that "]

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