$\frac{x^3+1}{1+x^2}$
$36y^2+100$
$8a-12a-0.75a$
$500x^{15}+108x^9$
$\lim_{x\to4}\left(\frac{x^2-7x+12}{x+4}\right)$
$2cos4x=0$
$\left(-x-3y\right)^2$
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