$2\cos x-2\cos x-1$
$21c-8c$
$\lim_{x\to3}\left(\sqrt[3]{3x^3+4x-5}\right)$
$a+b+c-d+a+b-c+d$
$-15x^3y^2z^4\left(4x^2y^3-5y^3z^4\right)$
$3+\sqrt{64}$
$\left(-6\right)^{19}$
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