यदि $\int \frac{d x}{3-2 \cos 2 x}=\frac{\tan ^{-1}(f(x))}{\sqrt{5}}+c$,(जहाँ $c$ समाकलन का स्थिरांक है),तो $f(\pi / 4)$ का मान ज्ञात कीजिए:

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

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