यदि $\int \frac{dx}{1-\sin^4 x} = A \tan x + B \tan^{-1}(\sqrt{2} \tan x) + C$ है,तो $A^2 - B^2 =$

  • A
    $-\frac{1}{2}$
  • B
    $\frac{3}{4}$
  • C
    $\frac{1}{4}$
  • D
    $\frac{1}{8}$

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