$\cos^2a\left(\sec^2-1\right)$
$27n-9f$
$\frac{4x^3-36x^2+108-108}{x-3}$
$a^3-2a^2+5a$
$\frac{dy}{dx}=\cos\left(2x\right)-\sin\left(x\right)$
$3\cdot\left(x+5\right)$
$\left(-3\right).\left(5\right).\left(-2\right)$
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