$4cos^2\left(\frac{\pi}{4}\right)-3sin^2\left(\frac{\pi\:}{4}\right)$
$s^3+8s^2+19s+12$
$5+4-6+9+19-18+15-49$
$6x^3-3x^2$
$12x\cdot x$
$\left(-31\right)-\left(-32\right)$
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