मान लीजिए $I_n = \int \sec^n x \, dx$ है। यदि $5 I_6 - 4 I_4 = f(x)$ है, तो $f\left(\frac{\pi}{4}\right)$ का मान ज्ञात कीजिए।

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

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फलन का समाकलन कीजिए: $\frac{1}{\cos (x+a) \cos (x+b)}$

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