Consider the function and the value of a.
f(x) =
, a = 9. (a) Use mtan = lim h?0
to find the slope of the tangent line mtan =f?'(a).
mtan =Â Â
(b)Find the equation of the tangent line to f at x =a.
(Let x be the independent variable and y bethe dependent variable.)
 Â
