$\frac{1}{4}\int\frac{sec^2z}{\sqrt{\left(1+tan^2z\right)+\frac{1}{4}}}dz$
$\lim_{x\to0}\left(\frac{2-\cos\left(x\right).\left(e^x-e^{-x}\right)}{x^2}\right)$
$9+8d+-9+-4+8d$
$6^{4-7}$
$\int\left(x^3-5\right)^8\:x^2\:dx$
$y''-10y'+21y=0$
$585+495$
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