$\lim_{x\to\infty}\left(\frac{x^2-x+1}{x+1}\right)$
$15-x^2-2x$
$\frac{y^4-4y^3+2y^2}{y^2}$
$\sqrt[4]{\left(x+y\right)^3}.\sqrt[12]{\left(x+y\right)^{-1}}.\sqrt[3]{\left(x+y\right)^4}$
$\left(-5x^4y^4\right)^3$
$\frac{dy}{dx}\sqrt{402}$
$2x^2\:x\:2x-4$
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