[微積] 微積分習題求解

[kevin3529 (大傑)]

let S be the region in the first quadrant bounded by curve xy=1, xy=3,
 x^2-y^2=1,x^2-y^2=4,compute 在S的區域中 對X^2+Y^2積分(符號不會打><)
他有給HINT G(x,y)=(xy,x^2-y^2) what is |detDG|?

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推 air11       :令u=x^2-y^2,v=xy,則|J|=1/(2(x^2+y^2))