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Mathematics
Problem
The function
f
(
x
)
=
(
x
2
−
1
)
∣
x
2
−
6
x
+
5
∣
+
cos
∣
x
∣
f(x) = (x^2 - 1)|x^2 - 6x + 5| + \cos|x|
f
(
x
)
=
(
x
2
−
1
)
∣
x
2
−
6
x
+
5∣
+
cos
∣
x
∣
is not differentiable at a. -1 b. 0 c. 1 d. 5
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