$\cos\left(3x\right)\cos\left(x\right)-\sin\left(3x\right)\sin\left(x\right)$
$x^2+14xy+49y^2$
$\lim_{x\to0}-\left(x+1\right)e^{-x}$
$\left(1c+2\right)\left(5c-11\right)$
$-4x^3+4x^3$
$-5ab-9ab-10ab$
$\frac{d}{dx}\left(\ln\left(x\right)^5\sin\left(x\right)\right)$
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