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Byju's Answer
Standard XII
Mathematics
Monotonically Decreasing Functions
the number of...
Question
the number of critical points of the function f(x)=|x-1||x-2| is
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Solution
f
x
=
x
-
1
x
-
2
f
x
=
-
x
-
1
-
x
-
2
,
x
≤
1
x
-
1
-
x
-
2
,
1
≤
x
≤
2
x
-
1
x
-
2
,
x
≥
2
f
x
=
x
-
1
x
-
2
,
x
≤
1
and
x
≥
2
-
x
-
1
x
-
2
,
1
≤
x
≤
2
f
x
=
x
2
-
3
x
+
2
f
'
x
=
2
x
-
3
2
x
-
3
=
0
x
=
3
2
f
x
=
-
x
2
+
3
x
-
2
f
'
x
=
-
2
x
+
3
x
=
3
2
So
,
there
are
3
critical
points
1
,
3
2
and
2
.
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