$y'+xy=3$
$\lim_{x\to-2}\left(\frac{25x^2-36}{5x+6}\right)$
$\frac{500}{-20}$
$senxsen2x-cosxcos2x=-cos3x$
$\:\left(3x\right)^{-\frac{1}{3}}$
$\int\frac{1}{\left(x^2+2x+1\right)\left(x+3\right)}dx$
$\frac{4mn^4}{2mn^2}$
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