$-9\left(2n\:\:-\:\:5\right)$
$\lim_{x\to4}-\left(x\right)$
$e^{8t}\left[cos\left(4t\right)+sen\left(6t\right)\right]$
$\left(a+g\right)^2$
$\sqrt{2^{4m-n}}.\:2^{\frac{n}{2}\cdot m}.\:4^{2-\frac{m}{2}}$
$\left(a+y\right)^2-\left(x-2y\right)^2+\left(x+2y\right)\left(x-2y\right)$
$-4:-1$
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