$x^2+2xy+y^2+3xy-4x^2-5y^2+6xy$
$9y^2+18$
$x^2-4x+29=0$
$\ln\left(\sqrt[2]{\cos\left(x\right)}\right)$
$\left|\left(-3\right)\cdot\left(+7\right)+\left(-2\right)\right|$
$4-3,24$
$\frac{x^{-4}y^{-5}y^2}{x}$
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