$-13\:-\:\left(-20\right)$
$x^2+8x+7=0$
$6^2-4x+4$
$-15\::\:-5$
$4x^2+12x^3-24x^5-8x^6$
$6sec^2\left(2x\right)+6\tan^2\left(2x\right)sec^2\left(2x\right)$
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