$\left(x+161\right)^2$
$\left[rs+4r-3s\right]^2$
$\lim_{x\to0}\left(-\ln\left(\left|x\right|\right)\right)^{\sin\left(x\right)}$
$6t-t^2$
$7y^2-14y^2z^4+y$
$\left(2x^5\right)\left(-5x^4\right)$
$9x^4:\:3x$
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