ધારો કે $f$ એ $\mathbb{R}$ પર બે વાર વિકલનીય વિધેય છે. જો $f^{\prime}(0)=4$ અને $f(x)+\int_{0}^{x}(x-t) f^{\prime}(t) d t=\left(e^{2 x}+e^{-2 x}\right) \cos 2 x+\frac{2}{a} x$ હોય,તો $(2 a+1)^{5} a^{2}$ ની કિંમત $\dots\dots$ થાય.

  • A
    $4$
  • B
    $8$
  • C
    $6$
  • D
    $2$

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$\int_{-5}^5 x^4\left(25-x^2\right)^{5 / 2} d x=$

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