$\cos^2x+3\sin^2x$
$\frac{dy}{dx}=\left(y^2+1\right)^{-1}$
$5x-3>2x+12$
$\frac{d}{dx}\left(y=\left(1+\frac{1}{x}\right)^x\right)$
$f\left(x\right)=\frac{e^{-x}}{e^{-2x}+9}$
$t^2+20t$
$6+z-z^2$
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