$+12x+7x$
$\cos^2x-4\cos^2-1=0$
$\left(4ab^2\right)\left(-7a^2b^3\right)$
$2x^2+2x-24$
$\left(5x\right)^2+13\left(5x\right)+42$
$y^2-10y-5$
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