$\lim_{x\to-3}\left(x+5\right)$
$\lim_{x\to0}\left(xsinx\right)$
$\frac{16y^7-24y^5}{8y^2}$
$x^3+3x^2-3x^2-9x+x+3+1$
$\cos2x+\sin^2x$
$\lim_{x\to\infty}\left(\frac{1}{\sqrt{2\:x^2+2x+1}}\right)$
$2\cdot y'+10y=1$
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