$5\left(2x-3\right)+3x+15$
$\left(xy-xz\right)\left(x-y\right)$
$\int w^2dw$
$\frac{d}{dx}c-d$
$5b\cdot10c$
$3\cos^2\left(x\right)-2\cos\left(x\right)-1$
$\frac{2\:\sin^3\left(x\right)}{1-\cos\left(x\right)}=2\:\sin\left(x\right)+\sin\left(2x\right)$
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