$-\sin\left(x\right)\cos\left(x\right)$
$x^2-4x-21\le0$
$x^2+x+1+x^2-1$
$\left(4x^3+3x^2-2x-5\right):\left(6x^2-1\right)$
$\lim_{x\to\infty}\left(\frac{x^3+3x^2+3x}{\left(x+1\right)^3}\right)$
$18k-12k+2m-m$
$\int\left(3t+2\right)cos\left(3t+2\right)dt$
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