calculus
posted by rachael .
find the xvalues at which f is not continuous. which of the discontinuities are removable?
f(x)=1/(x^2+1)

the function is not continuous when the denominator is zero, or...
0 = x^2+1
solving for x then
x = i
It is a removable discontinuity since it can be repaired by replacing a single point.