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Mathematics
Problem
Which of the following polynomial functions is an even function? a)
x
4
+
x
x^4+x
x
4
+
x
b)
x
3
+
1
x^3+1
x
3
+
1
c)
x
4
+
x
2
x^4+x^2
x
4
+
x
2
d)
x
4
+
x
3
x^4+x^3
x
4
+
x
3
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