$\left(4a+5b^2\right)^2$
$x^2-x+90$
$\left(3a^47b^5\right)^4$
$\lim_{x\to3}\left(\sin\left(x\pi\right)\right)$
$-\frac{8mn}{8mn}$
$\lim_{x\to0}\left(\frac{\sqrt[2]{1+x}-1+\frac{x}{2}}{x^2}\right)$
$-12n+2$
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