$\cos\left(ag\right)-\cos\left(bg\right)$
$a^2+15a+50$
$\left(1-3ax\right)\left(3ax+a\right)$
$\frac{dy}{dx}=-\sin\left(y\right)$
$\left(10k^3\right)^2$
$-4\left(-1\right)^2\:\left(2\right)+2\left(-1\right)\left(2\right)^2\:+3$
$\frac{12x^2+14x-8}{2}$
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