$\frac{x^4+2x^2-2x-35}{x+3}$
$\frac{\tan x}{\csc x+1}=\frac{\csc x-1}{\cot^3x}$
$\left(x-5x^4-7x^2\right)+\left(6-8x^2+5x\right)$
$\left(m^2-2n^2+2\right)+\left(m-7\right)\cdot\left(1-m\right)$
$-5+18-8$
$\frac{2x^2}{3+x^2}$
$2+9+-2$
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