Open Question: What Are All Of The Excluded Values?? (restrictions).. Help Pleasee!! (a-b)/(a+b)^2?

all values where
a + b = 0

or in other words
a = - b

for example:
-1,1
1,-1
7.-7
-7,7
2009,-2009
-2009, 2009
123456, -123456
-123456, 123456
etc

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