$\lim_{x\to\infty}\left(\frac{1}{x}\cos\left(x^2-3\right)\right)$
$t^2\frac{dy}{dt}=-ty$
$\frac{16}{1}+\frac{16}{1}$
$\frac{+x^2-x^2}{x^4+4x^2+4}$
$\frac{\left(1-2\:tanx\right)}{sinx}$
$\frac{tanx}{cosxcscx}$
$2x+3<3$
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