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OpenStudy (anonymous):
simplify and state excluded values. 2a+2/a^2-1
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OpenStudy (mertsj):
\[\frac{2a+2}{a^2-1}=\frac{2(a+1)}{(a-1)(a+1)}=\frac{2}{a-1}\]
OpenStudy (mertsj):
a cannot be 1 or -1
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