In Exercises 63-68, sketch the function represented by the given parametric equations. Then use the graph to determine each of the following:
a. intervals, if any, on which the function is increasing and intervals, if any, on which the function is decreasing.
b. the number, if any, at which the function has a maximum and this maximum value, or the number, if any, at which the function has a minimum and this minimum value.
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