Notice the inequality symbols.
exists as part of the right side of not the left.
Compare this question to part (a).
Compare this question to part (a). Even though
does not exist in the left side of the equation, since both sides approach we can evaluate what it approaches.
What do the results from parts (b) and (c) indicate about the graph?
continuous at ? In other words, does approach the same -value from the left and from the right of ?