[Calc] Find the x-values at which f is not continuous. Are these discontinuities removable? (Use k as an arbitrary integer. If an answer does not exist, enter

The function  f(x)  =  tan( pi·x/2 )  is discontinuous at  pi/2 + k·pi  for all integer values of  k  (including negatives).

These discontinuities are NOT removable because the  y-value  approaches  + infinity  from the left  and  - infinity  from the right at each of these discontinuities.