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In a triangle $\bigtriangleup ABC$,a,b,c are its sides ,A,B $\xi\;$ C are its angles, if $\cot A,\cot B\;\xi\;\cot C$ are in AP , the a,b, and c are in which progression?


1 Answer

Answer : (a) AP
Explanation : $\cot A,\cot B \;\xi\;\cot C$ are in AP
$2 \cot B=\cot A+\cot C$
answered Jan 2, 2014 by yamini.v