જો $\tan x = \frac{3}{4}$ અને $\pi < x < \frac{3\pi}{2}$ હોય,તો $\cos \frac{x}{2}$ ની કિંમત શોધો.

  • A
    $\frac{3}{\sqrt{10}}$
  • B
    $-\frac{3}{\sqrt{10}}$
  • C
    $-\frac{1}{\sqrt{10}}$
  • D
    $\frac{1}{\sqrt{10}}$

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