When we're looking at this problem, we notice the denominators never 0. So we don't have an issue with the denominator giving us anything undefined and not being continuous there. But what we do have is we have a trig function tangent X that is undefined at certain locations. If we thought about drawing our tangent X graph, we see that it's undefined at negative π halves, Pi halves, three Pi halves, etcetera. So it's undefined every time we have π halves times some integer N where the N is an odd integer.