$\frac{5}{2}+\frac{3}{-2}$
$\lim_{x\to0}\left(\frac{16-\left(4-x\right)^2}{x}\right)$
$\left(x+1\right)\left(x^2+x-2\right)$
$\frac{\cos^2\left(x\right)+\cos\left(x\right)-12}{\cos\left(x\right)-3}=\cos\left(x\right)+4$
$\frac{1}{\cos\left(x\right)}-\frac{\cos\left(x\right)}{1+\sin}=-\sin\left(x\right)$
$\frac{1}{t\left(t+1\right)\left(t+2\right)}$
$\frac{2x^4}{x^3}$
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