1.Prove that mixed partial derivatives u_(xy)=u_(yx) for u=pxp(x)(cos(y)- y sin(y)) .
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1.Prove that mixed partial derivatives u_(xy)=u_(yx) for u=pxp(x)(cos(y)- y sin(y)) .
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.