$\frac{\infty}{2\infty}$
$\int\frac{x^3+2x}{x^4+2x^2+3}dx$
$3a^2-14ab+10b^2+a^2-4ab$
$\left(\frac{2}{a^2}\right)^3\left(\frac{9^3}{4}\right)^2$
$4\left(4y-3x\right)$
$\int\frac{2x^2+x+8}{x^3+4x}dx$
$\cos x+\sin x\tan x=7$
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