$4z^2-16=36$
$\frac{x^2-x+2}{x^2}$
$\frac{\left(9x^2-26x-5\right)}{3t^2-5t-2}$
$cos^2x=sin^2x+\frac{1}{2}$
$200+2.33\cdot50$
$\left(3a-5b\right)^2$
$5\sqrt{2}\cdot\sqrt{4}$
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