$\left(a^2-1\right)^2+\left(a^2-1\right)-12$
$5x^3-2x^2-4x+5\:entre\:x^2-x+1$
$y^2-2y\cdot x$
$y^2dx=\left(1+x^2+y^2+x^2y^2\right)dy$
$x^3-x^2-14+24$
$-\frac{15amn^{-4}}{-3amn}$
$x-10=-24$
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