$\tan ^{-1}(x+1)+\cot ^{-1}\left(\frac{1}{x-1}\right)=\tan ^{-1}\left(\frac{8}{31}\right)$ માટે $x$ ના શક્ય મૂલ્યોનો સરવાળો કેટલો થાય?

  • A
    $-\frac{32}{4}$
  • B
    $-\frac{31}{4}$
  • C
    $-\frac{30}{4}$
  • D
    $-\frac{33}{4}$

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