MathematicsMedium66×since 2002Q4102The sum of possible values of x for tan^−-−1(x + 1) + cot^−-−1(1x−1)\left( {{1 \over {x - 1}}} \right)(x−11) = tan^−-−1(831)\left( {{8 \over {31}}} \right)(318) is :A−-−324{{{32} \over 4}}432B−-−334{{{33} \over 4}}433C−-−314{{{31} \over 4}}431D−-−304{{{30} \over 4}}430Check answerSkip