$\int sec^66xdx$
$\lim_{x\to4}\tan5x$
$\int\left(2x^4+x^8+1\right)^{\frac{1}{2\:\:}}dx$
$\frac{e^{-2x}}{e^x}$
$2\left(sec^2x\right)=\left(\frac{\left(1-sinx\right)}{cosx}\right)^2+\frac{1}{1-sinx}$
$\left(\frac{x^2}{2}+4\right)^2$
$4x^2-2+1$
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