问题描述：
mathematica积分问题!
提示NIntegrate::nlim:"z = -c\ Sqrt[1-(x^2+y^2)/a^2] is not a valid limit of integration"
提示NIntegrate::nlim:"z = -c\ Sqrt[1-(x^2+y^2)/a^2] is not a valid limit of integration"
问题解答：
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