વિધેય $f(x) = 1 + x + \int\limits_1^x (\ln^2 t + 2 \ln t) \, dt$ ની કિંમત જ્યાં $f'(x) = 0$ થાય છે તે શોધો:

  • A
    $e^{-1}$
  • B
    $0$
  • C
    $2 e^{-1}$
  • D
    $1 + 2 e^{-1}$

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જો $\int_0^x {f(t)\,dt} = x + \int_x^1 {t\,f(t)\,dt,}$ હોય,તો $f(1)$ ની કિંમત શોધો.

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