Let f(x) = 3x. (a) If a 0, use Equation 2.8.3 to find f(a). (b) Show that
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(a) If a ≠ 0, use Equation 2.8.3 to find f’(a).
(b) Show that f’(0) does not exist.
(c) Show that y = 3√x has a vertical tangent line at (0, 0). (Recall the shape of the graph of f See Figure 13 in Section 1.2.)
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