ધારો કે $\alpha$ અને $\beta$ $(\alpha < \beta)$ એ $18x^2 - 9\pi x + \pi^2 = 0$,$f(x) = x^2$,અને $g(x) = \cos x$ ના બીજ છે. તો $\int_{\alpha}^{\beta} x (g \circ f(x)) dx =$

  • A
    $\frac{\sqrt{3} - 1}{4}$
  • B
    $\frac{\sqrt{3}}{4}$
  • C
    $\frac{2 + \sqrt{3}}{2}$
  • D
    $\frac{1}{2} (\sin \frac{\pi^2}{9} - \sin \frac{\pi^2}{36})$

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