$\int \frac{dx}{4\sin^2 x + 5\cos^2 x} = $

  • A
    $\frac{1}{\sqrt{5}} \tan^{-1} \left( \frac{2\tan x}{\sqrt{5}} \right) + c$
  • B
    $\frac{1}{\sqrt{5}} \tan^{-1} \left( \frac{\tan x}{\sqrt{5}} \right) + c$
  • C
    $\frac{1}{2\sqrt{5}} \tan^{-1} \left( \frac{2\tan x}{\sqrt{5}} \right) + c$
  • D
    इनमें से कोई नहीं

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