$2cos^2x\:+\:cosx$
$65.45-23.546$
$x^8-2x^7-x^6$
$\frac{9x^3-18x^2+5x-2}{3x-4}$
$45\:+\:5\:x\:5\:-\:100$
$\left(x+2b\right)\left(x+4b\right)$
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