| In order for the limit to be 0, both the left and right limits must equal 0. But in fact neither of them equals 0:
x  0- f(x) = -1  0x 0+ f(x) = 3 0. |
| In order for the limit to be 0, both the left and right limits must equal 0. But in fact neither of them equals 0:
x 0- f(x) = -1 0x 0+ f(x) = 3 0. |