જો $\tan \theta = \frac{1}{\sqrt{5}}$ હોય અને $\theta$ પ્રથમ ચરણમાં હોય,તો $\cos \theta$ નું મૂલ્ય શોધો:

  • A
    $\sqrt{\frac{5}{6}}$
  • B
    $-\sqrt{\frac{5}{6}}$
  • C
    $\frac{1}{\sqrt{6}}$
  • D
    $-\frac{1}{\sqrt{6}}$

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