$\frac{x^2-16}{x+44}$
$y'=\cos2\left(x+y\right)$
$\frac{dy}{dx}+5x^7y=0,\:y\left(1\right)=3e$
$7ab+4ab-3ab$
$\frac{2^2+x-2}{x}$
$25u^2-64$
$\lim_{x\to\infty}\left(\frac{21x^3-2x^2+x-3}{x^3+2x^2-x+1}\right)$
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