$x^2+6x+15>0$
$5^2+2\cdot5\cdot b+b^2$
$\frac{x^3}{1-x}$
$\left(x-2y+4\right)\left(x+2y-4\right)$
$\left(3d+5\right)\left(3c+6x\right)$
$49m^6+70am^3n^2+25a^2n^4$
$\frac{\left(x^2-8x^3+15x^4\right)}{\left(3x^2+2\right)}$
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