यदि $f(x) = \int_a^x {t^3 e^t \, dt}$ है,तो $\frac{d}{dx} f(x) = $

  • A
    $e^x(x^3 + 3x^2)$
  • B
    $x^3 e^x$
  • C
    $a^3 e^a$
  • D
    इनमें से कोई नहीं

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