$\sec^2\left(x\right)=\frac{1}{\cos^2\left(x\right)}$
$\lim_{x\to\infty}\left(1+\frac{1}{2x}\right)^2$
$55.85-26$
$8y^3-27z^3$
$a^{\frac{1}{3}}-2+a^{-\frac{1}{3}}$
$x^2-4y^2=9$
$\frac{d}{dx}\left(x^2+2\right)\times\:\:ln\left(x^2+2\right)$
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