$49m^2-\:121n^4$
$8m=-16$
$\int5x^3cos4xdx$
$\left(2\sin\left(x\right)+11\right)\left(2\cos\left(x\right)+3\right)=0$
$\frac{5x^2-3x-2}{x^2-1}$
$\lim_{x\to0}\left(\frac{x^3+1}{x^5}\right)$
$\int\:3t^2dx$
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