[積分] 二重積分

[jeremyhcw (( ￣ c￣)y▂ξ)]

         dxdy
  ∫∫-------------------------
     [x^(2)+y^(2)+d^(2)]^(3/2)

        -a/2 <= x <=a/2
        -a/2 <= y <=a/2

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