[" In "Delta ABC," if "cot A,cot B,cot C...

[" In "Delta ABC," if "cot A,cot B,cot C" be in "A.P.],[" then "a^(2),b^(2),c^(2)" are in "],[[" (A) "H,P," (B) "G.P.,," A.G.P "],[" (C) "" A.P."," (D) "," (B."]]

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