If  A,B ,C  are the  angle  of ` Delta  ABC `  then ` cot  A .cot  B +  cot B  . "" cot  C   + cot
Channel: Doubtnut
Date: 2020-05-24

If  A,B ,C  are the  angle  of ` Delta  ABC `  then ` cot  A .cot  B +  cot B  . "" cot  C   + cot  C.cot A =`