ધારો કે $I_n = \int \sec^n x \, dx$. જો $5 I_6 - 4 I_4 = f(x)$ હોય, તો $f\left(\frac{\pi}{4}\right)$ ની કિંમત શોધો.

  • A
    $2$
  • B
    $4$
  • C
    $1$
  • D
    $\frac{4}{5}$

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