$2b^2-2a^2-2b^2-a^2$
$\frac{d}{dx}\left(-8\cos\left(2x\right)\right)$
$t^3-6t^2-36t-40$
$\int x\left(3x^2-4\right)^8dx$
$\left(-x^2-7x+2\right)\left(x-2\right)$
$4\cos^2b\:-\:2\sin^2b\:+\:2$
$\left(a+b\right)\left(a-b\right)-a^2-b^2$
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