To get rid of the absolute value signs in x2−y2(x2+y2)2. we need to rule out where in [0,1]×[0,1] this is positive and negative. But x2−y2=(x−y)(x+y). ... <看更多>
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To get rid of the absolute value signs in x2−y2(x2+y2)2. we need to rule out where in [0,1]×[0,1] this is positive and negative. But x2−y2=(x−y)(x+y). ... <看更多>
Yes, this is just an example. My true function that I want to take a double integral is more complicated. And I guess it's not easy to calculate ... ... <看更多>