$\int\frac{7}{\left(x+5\right)^2}dx$
$\left(a+5\right)^2\left(a-5\right)^2$
$\left(3a^2b+2^2\right)$
$15x^3y^2-2x^2y^3+6x^4y$
$x^2+6x+216$
$\lim_{x\to1}\left(\frac{2x-1}{x-1}\right)$
$1000-8x^3$
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