यदि $\frac{\sec 8\theta - 1}{\sec 4\theta - 1} = \frac{a + b\tan^2 2\theta}{1 + c\tan^2 2\theta + d\tan^4 2\theta}$ (जहाँ $\theta \neq \frac{n\pi}{16}, n \in I$),तो $(a - b + c - d)$ का मान है -

  • A
    $0$
  • B
    $1$
  • C
    $7$
  • D
    $13$

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