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Rational Expressions
medium
0:00.0
Excluded value for
\ac
x
2
−
1
x
2
+
1
\ac{x^2 - 1}{x^2 + 1}
\ac
x
2
−
1
x
2
+
1
?
A
None
B
1 and -1
C
0
D
Undefined
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