$\frac{x^2}{x^2+1}=1$
$\frac{d^2}{dx^2}\left(2z^2e^z\right)$
$-6x+5-7x-23$
$33.3-12.13$
$-84ab-16ab$
$\frac{1-\cos\left(2x\right)}{\tan^2x}=2\cos^2x$
$4\cdot p\cdot4\cdot p$
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