If `a^2 , b^2 , c^2` are in A.P., then prove that `cot A, cot B, cot C` are in A.P.
Channel: Doubtnut
Date: 2020-04-12

If `a^2 , b^2 , c^2` are in A.P., then prove that `cot A, cot B, cot C` are in A.P.