निश्चित समाकलन का मान ज्ञात कीजिए: $\int_0^{\pi /8} \frac{\sec^2 2x}{2} \, dx$

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{3}$
  • C
    $\frac{1}{2}$
  • D
    इनमें से कोई नहीं

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$ \int_{0}^{\frac{\pi}{2}} \frac{dx}{1+\cos x} = $

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$\mathop {\lim }\limits_{n \to \infty } \left[ {\frac{1}{{{n^2}}}{{\sec }^2}\frac{1}{{{n^2}}} + \frac{2}{{{n^2}}}{{\sec }^2}\frac{4}{{{n^2}}} + ..... + \frac{1}{n}{{\sec }^2}1} \right]$ का मान ज्ञात कीजिए।

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