Revised product rule to make order of factors consistent throughout text, including later dot product and cross product formulas.Added figure of x sin (1>x) in 3.2 to illustrate how oscillation can lead to nonexistence of a derivative of a continuous function.Added new Figure 3.9 using the square root function to illustrate vertical tangent lines.Clarified relation of slope and rate of change.Rewrote 2.5 Example 11 to solve the equation by finding a zero, consistent with previous discussion.Added new Example 7 in 2.4to illustrate limits of ratios of trig functions.Reworded limit and continuity definitions to remove implication symbols and improve comprehension.The definition of limits is now consistent with the definition in multivariable domains later in the text and with more general mathematical usage. Clarified definition of limits to allow for arbitrary domains.Added definition of average speed in 2.1.Removed peripheral material on regression, along with associated exercises.
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