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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$\begin{aligned} & \text{यदि } 5(f(x))^2 = x f(x) + 30 \text{ और } \\ & \int \frac{3 x^3 + (1 - 30 x^2) f(x)}{(10 f(x) - x)(x^3 - f(x))^2} dx \\ & = \frac{A}{B x^3 + D f(x)} + C, \text{ तो } A + B + D = \end{aligned}$

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यदि $\int \sqrt{\frac{2}{1+\sin x}} dx = 2 \log |A(x) - B(x)| + C$ और $0 \leq x \leq \frac{\pi}{2}$ है,तो $B(\frac{\pi}{4}) = $

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