$\frac{y^2+1}{y^2}\:\frac{dy}{dx}=\frac{1}{x^2+1}$
$\frac{n^2}{n+1}$
$a+b=\frac{\pi}{2}$
$-\left|-2\right|-\left|-3\right|$
$-3x^4+2x^2+1+2x^4-3x^3+3x-6$
$\left(4a^2-3ab\right)^2$
$2x^2+8x+\frac{8}{x}+2$
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