$3x^2-2x+xy$
$x^6-6x^3+9$
$4x^{-3}y\:^{-1\:}x\:y^3\:x\:4y^3$
$\cos\left(x\right)=-0.254$
$\sqrt{20x^8}$
$1+\cos\left(a\right).\sin\left(a\right)$
$x^2-5x-7=0$
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