$f\left(x\right)=\frac{x-1}{x^2-3x+2}$
$\int\frac{2}{3}\sqrt{9-x^2}dx$
$1\left(m-m-6\right)$
$x^2-\:4x\:+4\:<\:0$
$\left(3x+2\right)\left(2x+4\right)$
$-8x=x^2+2x.y$
$3ab\cdot5b$
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