$\left(2x^3\right)\left(\frac{1}{4}x^2\right)$
$7.9-49.35$
$x^2+y^2=4a^2x$
$\int_0^{\infty}\left(\frac{\arctan\left(x\right)}{x^2}\right)dx$
$3x^2-4x+2$
$\frac{a^2-3a^2-6}{a+3}$
$15-1+13-13+13-13+13-13$
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