$\frac{-2x-6}{1x+1}$
$cos^2\left(2t\right)+sin^2\left(2t\right)$
$-6x-12+8y+16x$
$21x^3y^3+7x^2y^3+14xy^6$
$2x\sqrt{x}+\frac{x^2+1}{2\sqrt{x}}$
$\lim_{x\to0}\left(3x^2\right)$
$1+x-x^2\:yz-x^3\:yz$
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