$5^{-4^0}$
$\frac{dy}{dx}=-xe^x$
$3+4-1+7$
$\frac{1}{\cos^2\left(a\right)}-\frac{1}{\cot^2\left(a\right)}=1$
$\lim_{x\to-\infty}\left(\frac{\sqrt{w^2-2w+3}}{w+5}\right)$
$\frac{\tan\left(37\right)+\csc\left(53\right)}{\sec\left(45\right)+\csc\left(45\right)}$
$\frac{60x^{7\:}b^2}{-45x^2b^7}$
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