यदि $\int_{0}^{1} 4 \cot^{-1}(1-x+x^{2}) dx = a \tan^{-1}(2) - b \log_{e}(5)$, जहाँ $a, b \in N$, तो $(2a+b)$ का मान ज्ञात कीजिए:

  • A
    $7$
  • B
    $8$
  • C
    $9$
  • D
    $10$

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यदि $\int_{ - a}^a {\sqrt {\frac{{a - x}}{{a + x}}} \,dx = k\pi ,} $ है,तो $k = $

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$\int_1^3 \left[ \tan^{-1} \left( \frac{x}{x^2-1} \right) + \tan^{-1} \left( \frac{x^2-1}{x} \right) \right] dx =$

मान लीजिए $f(x) = \frac{x}{(1+x^n)^{1/n}}$,$x \in R - \{-1\}$,$n \in N$,$n > 2$. यदि $f^n(x) = (f \circ f \circ f \dots n \text{ बार})(x)$ है,तो $\lim_{n \to \infty} \int_0^1 x^{n-2} (f^n(x)) dx$ का मान $...............$ है।

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