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Mathematics
Mathematics
Problem
The function
f
(
x
)
=
(
x
2
−
1
)
(
x
2
−
3
x
+
2
)
+
cos
(
∣
x
∣
)
f(x) = (x^2 - 1)(x^2 - 3x + 2) + \cos(|x|)
f
(
x
)
=
(
x
2
−
1
)
(
x
2
−
3
x
+
2
)
+
cos
(
∣
x
∣
)
is not differentiable at a.
−
1
-1
−
1
b.
0
0
0
c.
1
1
1
d.
2
2
2
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