设f(u,v)具有二阶连续偏导数,且满足?2f?u2+?2f?v2=1,g(x,y)=f[xy,12(x2-y2)],求?2g?x2+?2g?y

设f(u,v)具有二阶连续偏导数,且满足?2f?u2+?2f?v2=1,g(x,y)=f[xy,12(x2-y2)],求?2g?x2+?2g?y2.

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