$0.25k^2+0.5k+0.25$
$-4-1+8$
$2\sin2\theta\cos2\theta$
$z^4-64w^2$
$3e+7-e\:2e+10+2e-3$
$\lim_{x\to3}\left(\frac{x^2-8x+15}{\left(x-3\right)^2}\right)$
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