$-103-289$
$\frac{2x+1}{x^2+x-2}$
$\frac{\tan\left(x\right)}{\tan\left(x\right)-1}$
$100a^2b^3c-150ab^2c^2+50ab^3c-200abc^2$
$\sqrt{48n^5}$
$\frac{\left(tan^2x\right)}{\left(tanx+1\right)\left(tanx-1\right)}$
$\lim_{x\to2}\left(\frac{x^2+3x}{x-1}\right)$
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