$\tan a.cot\:a-sen^2a$
$\left(x+5\right)\left(x-2\right)=0$
$\left(5.8\cdot10^{-9}\right)\cdot\left(6.1\cdot10^7\right)$
$25-\left(-3\right)-2+\left(-7\right)$
$-12=y-36$
$\frac{\left(5r^5\right)^2}{3r^2}$
$4xydx+\left(2x^2+1\right)dy=0$
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