$y^6-81\frac{y^6-81}{y^3-9}$
$\int\frac{y+4}{y^2+y}dy$
$\frac{cos\left(a\right)}{sin\left(a\right)+1}\:+\:tan\left(a\right)$
$9u^2-30uy+25y^2$
$\frac{x^2+x+1}{\left(x+2\right)\left(x^2+1\right)}$
$108\cdot4$
$x^4+2x^3-3x^2-4x+4$
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