$\frac{\left(a+b\right)\left(a-b\right)}{a^2-2ab+b^2}$
$\left(5x^2+4y^2\right)dx+\left(4y^2+8xy\right)dy=0$
$a^6-x^6$
$t^{\frac{1}{3}}\left(t-4\right)$
$\frac{tan\left(b\right)-cot\left(b\right)}{tan\left(b\right)+\:cot\left(b\right)}=2sen^2\left(b\right)-1$
$\int x\left(3x+1\right)dx$
$x^2-\frac{3}{2}x+\frac{3}{4}^2$
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