Simplifying
$2a^2-5a+3$
$\frac{3x^3+x-4}{x+2}$
$\int\frac{1}{\left(x^2+2x+4\right)\left(x^2+x+1\right)}dx$
$\frac{1}{\left(1-z^{-1}\right)\left(1-0.5z^{-1}\right)}$
$\frac{d^2}{dx^2}\sec\left(5x\right)$
$\left(-20:4+7\right)$
$\frac{12^9}{12^2}$
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