$\int\frac{5x-2}{\left(x+5\right)\left(x-4\right)}dx$
$2sen^2\left(x\right)-sen\:x-2=0$
$x^2+12x-10=0$
$3xy^227x^2y^318xy^2$
$144y^2-256$
$\frac{y+4}{3y-9}$
$\frac{7x^2-3x^4+1}{x-1}$
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