$\int\frac{9x^2}{3x-2}dx$
$\lim_{x\to4}\left(\frac{2x^2-7x-4}{x-4}\right)$
$5^{1^{2^0}}$
$-\left(-1\right)^4$
$6x^2+19x+26=9x^2+34x+44$
$\left(5x-2\right)^2=15$
$\int\:\frac{2x+1}{x^2-5x+6}dx$
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