1.

If `tan^(-1)a+tan^(-1)b+tan^(-1)c=pi` then prove tjhat `a+b+c=abc`A. a+b+c=abcB. ab+bc+ca=abcC. `(1)/(a)+(1)/(b)+(1)/(c )-(1)/(abc)=0`D. `ab+bc+ca=a+b+c`

Answer» Correct Answer - C


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