$-20+45-30+71$
$tan^2\left(3y\right)-2sec\left(3y\right)-2=0$
$4x-8>16$
$\lim_{n\to\infty}\:\left(\frac{2}{\sqrt{n}\left(\sqrt{n+1}-\sqrt{n}\right)}\right)$
$2x^4+x^2-4x-1+4^4-2x$
$\int sec^2\left(2x\right)sec^3\left(2x\right)dx$
$dx-2ydy=0$
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