$0 < a < 1$ માટે,સંકલન $\int_0^\pi \frac{d x}{1-2 a \cos x+a^2}$ ની કિંમત શોધો.

  • A
    $\frac{\pi^2}{\pi+a^2}$
  • B
    $\frac{\pi^2}{\pi-a^2}$
  • C
    $\frac{\pi}{1-a^2}$
  • D
    $\frac{\pi}{1+a^2}$

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જો $n \geq 1$ માટે,$P_n = \int\limits_1^e (\log x)^n \, dx$ હોય,તો $P_{10} - 90P_8$ ની કિંમત શોધો.

ધારો કે $J = \int_0^1 \frac{x}{1+x^8} dx$. નીચેના વિધાનો ધ્યાનમાં લો:
$I$. $J > \frac{1}{4}$
$II$. $J < \frac{\pi}{8}$
તો,

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જો $f(x) = \frac{e^x}{1 + e^x}$,$I_1 = \int_{f(-a)}^{f(a)} x g\{x(1 - x)\} dx$,અને $I_2 = \int_{f(-a)}^{f(a)} g\{x(1 - x)\} dx$ હોય,તો $\frac{I_2}{I_1}$ ની કિંમત શોધો.

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