$\frac{324m^4+36n^2}{18m+6n}$
$\left(2.6\right).\left(4.9\right)$
$\int_0^r\left(e^{-r}\right)rdr$
$\left(16+z^2\right)\left(16-z^2\right)$
$f\left(x\right)=\:\frac{3x^2-4x}{5x^2-3}$
$\sqrt{20x^2}-2\sqrt{5x}+6x\sqrt{45}$
$6x^2-2x^2+7x-4x$
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