$\int\frac{x-1}{x^2-4x+5}dx$
$x^2+16x+16=0$
$\int\frac{x^2}{x^2-8}dx$
$\left(a^3-\:7b^2\right)\:\left(7b^2\:+\:a^3\right)$
$235.61-23.5$
$4x\:+\:5=3x+20$
$\left(-1+i\right)$
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