$\frac{xy+3x-4y-12}{2xy+4x-8y-16}$
$\left(x^4-9\right)\left(x^4+1\right)$
$49x^2+9y^2+294x-180y-423=0$
$\sqrt{-56}$
$a^2-b^6$
$\int_0^b\left(e^x\right)dx$
$4x^3-3x+1$
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