$\frac{1}{\cos^2\left(x\right)}-2\tan\left(x\right)-4=0$
$\frac{7}{2-4x}$
$\int x\sqrt{8x-x^2}dx$
$4\left(\infty^2\right)+1$
$3\left(x+3\right)^2$
$\left(\:x^4\:-\:2x^2\:\:-\:3\:\:\:\right)$
$\lim_{x\to0}\left(\frac{10sin\left(14x\right)}{ln\left(14x\right)}\right)$
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