$y=\frac{2}{9}xe^{-2x}$
$2\:sin\:2x\:=\:.5$
$-5\cdot\left(-5\right)\cdot\left(-5\right)\cdot\left(-4\right)$
$2x+4xy-x+6xy$
$\left(\frac{9}{7}x^8-\frac{5}{6}y^4\right)^2$
$x^2+5>0$
$\frac{x^2-4x-5}{x}$
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