$3r+7r$
$\left(f+y+3w\right)\left(f+y+3x\right)$
$\int x^6\sqrt{x^7+6}dx$
$\lim_{x\to2}\left(\sqrt{x+23}\right)$
$\frac{\cot+\cot}{\tan+\tan}=\cot2$
$\int_4^5x^3\cos\left(x\right)dx$
$2x^2-16x+4$
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