$7x^2+2x-3-5x+2$
$70m^3+35m^2m^3$
$\lim_{x\to0}\left(\frac{lnx}{1-x}\right)$
$1+cos2x+2sin^2x=2$
$\lim_{x\to0}\left(\frac{x}{sen\sqrt{x}}\right)$
$x^2+5x-11$
$\int\frac{16\left(x+2\right)}{\left(x-2\right)\left(x^2+4\right)^2}dx$
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