$\left(m+7n\right)\left(m-7n\right)$
$8x^4\cdot2yx^3$
$\frac{1}{\cos\left(x\right)^2}+\tan\left(x\right)^2=2$
$6\left[7m-\left(9m-3\right)+1\right]$
$14d\:+\:21\:and\:7\left(2d\:+\:3\right)$
$\left(x^3-a^3\right)\left(x-a\right)$
$\lim_{x\to34}\left(\frac{cos\left(xt\right)-\cos\left(34t\right)}{1156-x^2}\right)$
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