$\left(\frac{2}{5}x+\frac{1}{4}y\right)\left(\frac{2}{5}x-\frac{1}{4}\right)$
$\left(\left(2y^{-4}x^2\right)^2\right)^{-1}$
$\sqrt{20z^2}$
$12^2+20^2$
$x=3\tan\left(y\right)$
$7=n-2$
$26-5.\left[10+4.\left(5-6\right)\right]$
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