$\left(9x+7y\right)\left(81x^2-63xy+49y^2\right)$
$a^2+2x+1=0$
$\int_{-1}^1e^{-2x}dx$
$3x^4+33x^3+126x^2+216x+135$
$0.36x^4-1.2x^2y+y^2$
$\left(\frac{1}{2}g-\frac{1}{3}\right)^3$
$xy\:=\:1\:+\:x^2$
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