$\:\frac{1}{x}dx+dy\:=\:0.\:$
$\frac{2x+16}{4}$
$-2\sin\left(9x\right)^2+1$
$18n-31n^4-37n^2-11n^3$
$4x^2+27x=7$
$\int\frac{2x^3+4x^2-x-3}{x^2-2x-3}dx$
$2-\frac{3}{x}-\frac{4}{x^2}$
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