$\frac{m^2+1}{m+1}$
$e^x+e^x$
$3xy-xy^2+2xy+xy^2+x^2y$
$\frac{64a^3+b^9}{4a+b^3}$
$\int\:\sqrt{9x^2+45}dx$
$4xe-3x$
$6n^2-96$
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