$x+x^{-1}=3$
$y^2+2yx+x^2$
$\int\left(\frac{cosx}{1-cosx}\right)dx$
$3n+3=4y-57$
$\int7xe^{-3x}dx$
$\frac{x^3-1}{x^2+1}$
$\left(3x^4-2\right)dx-2ydy=0$
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