$2\left(-2+7n\right)-5\left(1-4n\right)$
$\frac{1}{1-x+\sqrt{5-x^2}}$
$-35m^2n^3-70m^3$
$5.4\cdot100$
$-\tan\left(4x\right)^{-1}=-\pi$
$\lim_{x\to0}\left(\frac{6-6\cos\left(x\right)}{sin\left(5x\right)}\right)$
$\left(3\:+\:2y\right)^5$
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