Question: [8 points] Let f be a function of two variables of the kind we commonly see in our course and let ,w=f(s2-t2,t2-s2) where s and

[8 points] Let f be a function of two variables of the kind we commonly see in our course and let ,w=f(s2-t2,t2-s2) where s and t are some independent variables. Verify thattdelwdels+sdelwdelt=0

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