$2m^2-13m+15$
$8-\left(-2\right)+7-2$
$\frac{sin\left(x\right)}{\cos\left(x\right)+1}+\frac{sin\left(x\right)}{cos\left(x\right)-1}=-\frac{2}{tan\left(x\right)}$
$-4x^{-6}\cdot5x^9$
$x^2-14x+80$
$b^2+20+b$
$121x^4-144x^8$
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