Applicare la formula: $\ln\left(x^a\right)$$=a\ln\left(x\right)$, dove $a=\frac{1}{2}$ e $x=3x^3ye^x+2xye^y$

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=d^2f$, $b=dx\cdot dy$, $c=1$, $a/b=\frac{d^2f}{dx\cdot dy}$, $f=2$, $c/f=\frac{1}{2}$ e $a/bc/f=\frac{1}{2}\frac{d^2f}{dx\cdot dy}\ln\left(3x^3ye^x+2xye^y\right)$

Applicare la formula: $1x$$=x$, dove $x=d^2f$