$\frac{d}{dx}\left(\ln\left(y\right)=\cos\left(x\right)^{\frac{1}{x}}\right)$
$\frac{10z}{\sqrt{5z}}$
$x-3\le0$
$\left(w-1\right)^2=2w^2-5w-27$
$\sqrt{98x^2}$
$\lim_{x\to0}\left(\frac{\cos\left(x\right)-1}{e^2-t-1}\right)$
$18+-1$
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