$4xe5+8xe3$
$\int\cos\left(4x^2\right)\left(9x\right)dx$
$x^2-6xy+9y^2$
$\frac{x}{\left(2x+\sqrt{x}\right)}$
$\frac{6x^2}{18x}$
$\frac{\left(x^2+2x+1\right)}{4x^2+1}$
$\left(6k+2l\right)$
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