$8a^2b^2-20a^3$
$\frac{d}{dx}\sqrt{1+\sqrt{x}}$
$9x^2+18x$
$\lim_{x\to0}\left(\frac{sinx}{\pi-x}\right)$
$\left(a^{x-1}-6\right)\left(a^{x-1}-5\right)$
$\left(x+2\right)\left(x+3\right)^2-13$
$x+y=41$
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