$2x^2-36x+81$
$\sqrt{9x^2-18+5}$
$5x^2y+3x=2y+6$
$x^2+y^2=-2xy+6x$
$\lim_{x\to\infty}\left(\frac{8x^3+5x-2}{4x^4+3}\right)$
$\left(10+7y\right)^2$
$\int\:\frac{\sqrt{\:15-16x^2}}{x}dx$
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