2. Use the definition of the derivative to find the slope of the line tangent to the graph of $f$ at the point $P$ (or the $x$-coordinate $a$) and find the equation of the tangent line at the point $P$ (or the $x$-coordinate $a$) in slope-intercept form. No short-cuts allowed.\ C. $f(x) = \frac{x}{2x+1} P(1, \frac{1}{3})$
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