$\lim_{x\to\infty}\left(7x\right)^{\frac{4}{x}}$
$5xy^2-15y$
$\lim_{x\to81}\left(\frac{\sqrt{82-x}-1}{9-\sqrt{x}}\right)$
$-120+3\left(4-5\right)+8-12\:\left(7-3\right)$
$\int5ln\left(x^4\right)\cdot x^2$
$n^2-11n+121$
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