यदि $\tan \theta = - \frac{1}{\sqrt{10}}$ और $\theta$ चौथे चतुर्थांश में स्थित है,तो $\cos \theta = $

  • A
    $1/\sqrt{11}$
  • B
    $-1/\sqrt{11}$
  • C
    $\sqrt{\frac{10}{11}}$
  • D
    $-\sqrt{\frac{10}{11}}$

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