$rs+4s$
$\frac{899.25}{10}$
$\frac{x^2-8x+3}{x-5}$
$5cos2x=2$
$10k-3k+5h+2h$
$3m^2\left(-4am^{-2}\right)$
$\lim_{x\to2}\left(\frac{5x^2-13x+6}{4x^2-9x+2}\right)$
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