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\begin{document}
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\underline{GEOM INTERP}\\
Find the tangent line to $y=f(x)$ at $P=(x_0,y_0)$.
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A picture.
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$y-y_0=m(x-x_0)$\\
\underline{point} $y_0=f(x_0)$\\
\underline{slope} $m=f'(x_0)$
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\end{document}