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Derivatives
Question
f
(
x
)
=
x
−
1
+
x
+
24
−
10
x
−
1
(
1
<
x
<
26
)
then
f
′
(
x
)
=
Moderate
A
0
B
1
x
−
1
C
2
x
−
1
−
5
D
1
Solution
f
(
x
)
=
x
−
1
+
x
+
24
−
2
25
(
x
−
1
)
=
x
-
1
+
25
−
x
−
1
=
5
⇒
f
'
x
=
0
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