$\tan\left(20\pi^4+\frac{\pi}{4}\right)$
$\left(4m^2+mn-3n^2\right)\left(4m^2+mn-3n^2\right)$
$6x\left(5x-2\right)^0$
$7m^2\left(2m-1\right)\left(m+9\right)$
$x^2+8x-19$
$2^{5^0}$
$\lim_{x\to0}\left(\frac{arctan\left(4x\right)}{x}\right)$
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