$x^2-7x+6=\left(x-2\right)^2+4\left(x-3\right)$
$x^9y^6+125$
$sin2x-cotx$
$3b^2-5b+1$
$\left(-6.6\right)^0$
$\lim_{x\to0}\left(x+2^x\right)$
$-\int\frac{xe^{-\frac{3}{5}x}.\:\frac{1}{5}e^{-\frac{1}{5}x}}{-1\:xe^{-\frac{2}{5}x}}dx$
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