$xy'+2y-x^3=0$
$12x^2+5x-2=0$
$\int e^{\frac{-x}{2}}cos\left(5x\right)\:dx$
$7a^2-15b^2+5b^2+9a^2-4b^2$
$cosx-1=cos2x$
$\frac{x^2-7x+5}{x-5}$
$-\int\frac{3}{x^2+1}dx$
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