$\:-\left(-2\right)+\left(-3\right)-\left(+8\right)-\left(-1\right)$
$4x^2\:+\:25y^4\:-\:20xy^2$
$ln\left|sin\left(x\right)\right|-ln\left|cos\left(x\right)\right|$
$p^2-36$
$\left(2a^2b+2x\right)^3$
$3m+2=23$
$\left(3+x\right)^5$
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