$\frac{dy}{dx}=\frac{e^x+1}{2y}$
$\lim_{x\to0}\left(\frac{\ln^2\left(1-x\right)}{cosx-1}\right)$
$\left(\frac{1}{4}-2\right)^2$
$\frac{t^4-t^2+7t+2}{t^2-2t^2+3t+1}$
$-6x+8y=24$
$\frac{3x^4}{2x^2-x-1}$
$\frac{-3}{5}x\frac{-1}{4}\le\frac{2}{7}$
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