$\lim_{x\to0}\left(\frac{sin\left(3x\right)+x^4}{x^3}\right)$
$\left(3y-9\right)^2$
$\frac{54}{9}$
$\lim_{x\to+0}\left(2x\right)^x$
$x^2+16x+16=0$
$z=x^2-2xy$
$\int\left(\frac{x^3}{1-3x^4}\right)dx$
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