"y=(x\\ln x)^n" ;
"y'=n(\\ln x+1)(x\\ln x)^{n-1}" ;
"y''=n(n-1)(\\ln x+1)(x\\ln x)^{n-2}+n\\frac{1}{x}(x\\ln x)^{n-1}=n(x\\ln x)^{n-1}\\left(\\frac{(n-1)(\\ln x+1)}{x\\ln x}+\\frac{1}{x}\\right)" ;
"y^{(n)}=n!\\ln^nx"
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