$\lim_{x\to0}9x^{-2}e^x$
$\sqrt{1089}\cdot\left(-5\right)$
$\left(-3\right)\left(-1\right)\left(-2\right)\left(-2\right)$
$\left(x+4\right)20\cdot\left(x+4\right)^2$
$y^2+8y-y^3+y^4$
$\left|9-7\left(5\right)\right|-\left|2\left(2\right)-7\right|$
$3\cos4+6\sin$
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