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${\mathbb{R}}$%
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$\displaystyle \frac{dy}{dx} $%
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$(2,0)$%
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$\displaystyle f'(-3) = \lim_{x \rightarrow -3} 
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{\newpage\clearpage
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{\newpage\clearpage
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$[-1,3]$%
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$s$%
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$x$%
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$0 < x \leq 20 $%
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$x=20-17=3$%
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$\displaystyle s = \frac{36}{x} \Rightarrow \frac{ds}{dt} =
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$-6$%
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\end{document}