$4h^2+8h-5$
$-1\cdot13+12$
$\frac{u}{5}+15\le36$
$log\:x^2+\:2x\:$
$\lim_{x\to0}\left(\frac{1+\cos\left(\pi x\right)}{\tan^2\left(\pi x\right)}\right)$
$7\:cos\left(x\right)+1=-3\:cos\:\left(x\right)+6$
$3a+7-11-9a$
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