यदि $I=\int_{-a}^a(x^4-2x^2)dx$ है,तो $I$ का मान $a=$ पर न्यूनतम है।

  • A
    $2$
  • B
    $-\sqrt{2}$
  • C
    $\sqrt{2}$
  • D
    $-2$

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