$\left(2-y\right)\left(2+y\right)\left(4-2y+z^2\right)\left(4+2y+y^2\right)+y^6-60$
$\left(3a^4-5b^2\right)\left(3a^4+5b^2\right)$
$a^2+13a+40$
$\frac{2\left(-5\right)-7\left(3-5+2\right)-2\left(3^2-1\right)}{3-2\left(5-7\right)-5}$
$\left(12x\right)\left(144x^4\right)$
$\lim_{x\to\pi}\left(\frac{\sen\left(\pi-t\right)}{\pi-t}\right)$
$\left(a+c\right)\cdot\left(7a+2c\right)$
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