$\left(x^2\:-1\right)y'+x\left(y-9\right)=0$
$1-3x^2+x+1$
$\int\frac{1}{5-2x^2}dx$
$\lim_{x\to infinity}\left(xe^{-x^2}\right)$
$\lim_{x\to0}\left(\frac{sen\:\left(42\:x^2\right)}{x\:tan\:\left(7x\right)}\right)$
$-9\left(-5a-1\right)$
$\left(10+4\right)+\left(6-9b\right)-\left(3b-7\right)+20+\left(-7+2x\right)-\left(-3x-7\right)$
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