$\frac{d}{dx}\frac{2e^x-3}{2e^x+3}$
$3x^2-15x+6$
$4^2-2^2$
$\sqrt{36}+64+2-20$
$\left(2cosx\right)^2=2$
$\int\frac{3x^2}{\sqrt{x^2-4}}dx$
$-\frac{4}{2}$
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