$\left(r-3\right)^4$
$\sec\left(3\right)\tan\left(3\right)$
$\frac{m}{5}+\frac{m}{8}=\frac{41}{20}-\frac{7}{10}m$
$5\left(x-7y\right)$
$25xz-3x-4xz$
$\lim_{x\to0}\sqrt{x}\sin^{\frac{1}{x}}$
$\lim_{x\to+\infty}\left(x^2-x^3+6x^5-x^7\right)$
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