$6\sec^2\left(x\right)-8=0$
$\:9w^2\left(w^4+w^2z^2+z^4\right)-8\left(w^2+z^2\right)$
$=8\times124$
$\lim_{x\to1}\left(\frac{cos\left(\pi\:x\right)+x^2}{lnx-2x+2}\right)$
$\frac{\left(2x^2-3\right)}{x\left(x+5\right)}$
$\frac{dy}{dt}=2u$
$\lim_{h\to0}\left(\frac{\sqrt{4w-3}-\sqrt{4w-3}}{h}\right)$
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