$\left(14-n^{2x}\right)\left(14+n^{2x}\right)$
$\frac{7^{2t}}{49^{0.5}}$
$\lim_{x\to0}\left(\frac{7^x-9^x}{x^2}\right)$
$5\left(-1\right)\left(-9\right)$
$y'=2xe^{x^2-y}$
$\frac{x^4+x^3-6x^2-4x+8}{1}$
$y^2\:dx+dy\:=\:ydx$
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