$\left(6x+9\right)\left(3x-12\right)$
$-\left|\left(-2^3\right)+\left(-5^2\right)+\left(-15\right)\right|$
$4c\left(-2c+5\right)$
$\sin\left(x\right)\cos^2\left(x\right)+\cos^6\left(x\right)$
$\left[\left(13^4\right)\right]^9$
$\frac{1}{\cos\left(x\right)}\left(\cos\left(x\right)-\cos^3x\right)$
$\left(-4\right)\left(-2\right)$
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