$9+-11\:+17\:+17\:+-5\:+6+-1+7$
$4x^2y^2-8x^2b$
$\frac{d}{dx}\frac{x}{x+y}+\frac{y}{x}=1$
$\cos^2x-4\cos x+3$
$\frac{4x^3-5x^2-2x+1}{x-1}$
$\left(a^3x+by^3\right)^2$
$\lim_{x\to\infty}\left(\frac{\sqrt{x+x^2}}{x+2}\right)$
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