$\frac{1-b^2}{\left(1+bx\right)2+\left(b+x\right)2}$
$\int\frac{\sqrt{25-16x^2}}{x^2}dx$
$38x^2+25x-250$
$\lim_{z\to2}\left(\sqrt{\frac{4x^3-2}{2x+1}}\right)$
$\frac{x^5-x^3+x}{x-2}$
$6x^4-10x^3+2y$
$2x^2+4xy-6x+2xy+x+y-4x-2x^2$
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