$\frac{3x^4-4x^2-8x+4}{-4}$
$\int\left(\frac{x^3}{x^2-x-2}\right)dx$
$\left(2x-3y^2\right)dx+\left(2y-6xy\right)dy=0$
$\lim_{x\to1}\left(\frac{t^9-1}{t^8-1}\right)$
$6x^3-3x^2+2x-5\:\:\:\:si\:x=-3$
$-x-3x+a$
$v+9=-48$
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