$\int_0^1 \frac{\log _e(1+x)}{1+x^2} d x=$

  • A
    $\frac{\pi}{4} \log _e 2$
  • B
    $\frac{\pi}{6} \log _e 2$
  • C
    $\frac{\pi}{2} \log _e 2$
  • D
    $\frac{\pi}{8} \log _e 2$

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વિધાન $(A)$: $\int_{\frac{\pi}{6}}^{\frac{\pi}{3}} \frac{(\sin x)^{\sqrt{2}} dx}{(\sin x)^{\sqrt{2}}+(\cos x)^{\sqrt{2}}} = \frac{\pi}{12}$
કારણ $(R)$: $\int_{a}^{b} \frac{f(x) dx}{f(x)+f(a+b-x)} = \frac{b-a}{2}$

$\int_{-\pi / 4}^{\pi / 4} x^3 \sin ^4(x) d x=$

ધારો કે $f : R \to R$ એક વિધેય છે જેથી તમામ $x \in R$ માટે $f(2 - x) = f(2 + x)$ અને $f(4 - x) = f(4 + x)$ છે. જો $\int_{0}^{2} f(x) dx = 5$ હોય,તો $\int_{10}^{50} f(x) dx$ નું મૂલ્ય શોધો.

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