$\frac{3m^3-5n^3}{m^3+n^3}$
$\left(\left(90x+120\right)\right)$
$\lim_{x\to1}\left(-\ln\left(\left|x\right|\right)\right)^{\sin\left(x\right)}$
$\frac{d}{dx}\:x\:\cos\:y\:+y\:cos\:x\:-1\:=0$
$-9x+7+3x-8$
$1000a^{12}+8b^6$
$\frac{2+2\cos\left(x\right)}{\left(cosx+1\right)^4}$
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