यदि ${\tan ^{ - 1}}\frac{{x - 1}}{{x + 2}} + {\tan ^{ - 1}}\frac{{x + 1}}{{x + 2}} = \frac{\pi }{4}$,तो $x =$

  • A
    $\frac{1}{{\sqrt 2 }}$
  • B
    $-\frac{1}{{\sqrt 2 }}$
  • C
    $\pm \sqrt{\frac{5}{2}}$
  • D
    $\pm \frac{1}{2}$

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