$\int\frac{5x^2+3x-3}{x^3+2x^2}dx$
$\frac{\left(1+cosx\right)^2}{sin^2x}=\frac{1+cosx}{1-cosx}$
$2x+6x-5y+4x$
$\frac{dy}{dx}=\frac{3y}{x}+1$
$\frac{x^n}{n\left(n+2\right)}$
$2a^2x^2-x^2z$
$\lim_{x\to0}\left(\frac{e^2}{\cos x-1}\right)$
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