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Mathematics
Problem
Find the constant term in the expansion of
(
x
+
1
)
3
+
(
1
−
x
)
(
x
2
+
x
+
1
)
(x+1)^3 + (1 - x)(x^2 + x + 1)
(
x
+
1
)
3
+
(
1
−
x
)
(
x
2
+
x
+
1
)
. a)
1
1
1
b)
−
2
-2
−
2
c)
2
2
2
d)
3
3
3
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