$\lim_{x\to0}\left(sec\:\left(x\right)\right)^{\frac{1}{x}}$
$\frac{dx}{dy}=\frac{cos\:x}{cos\:y}$
$4x^4+144x^2$
$\left(-2\right)\left(9\right)$
$\left(\frac{1}{2}m-3n^3\right)^2$
$2m+5m$
$\int\frac{x+14}{x^2-2x-8}dx$
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