Find all points of discontinuity of f, where f is defined by
6 2
3, if
2
( )
2
3, if
> 2
x
x
f x
x
x
+
≤
= 
−

7 |
| 3, if
3
( )
2 , if
3
< 3
6
2, if
3
x
x
f x
x
x
x
x
+
≤ −
=
−
−
<

+
≥

8 |
|, if
0
( )
0,
if
0
x
x
f x
x
x

≠
= 

=

9