$\lim_{x\to0}\left(\frac{3+n^2}{1-n}\right)$
$3x^2+2x-3$
$\int_1^2\left(senxln\left(cosx\right)\right)dx$
$\int x\left(xf^2+2\right)dx$
$cy+2x=3$
$-7x=-8x+x$
$\left(a+b\right)\left(c+d\right)$
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