The expression is defined for all the real values except x = -y , y = -x.
An expression is a mathematical statement consisting of constants , variables and mathematical operators.
The expression given in the question is 1/(x +y)
An expression f(x) is undefined when the denominator = 0
f(x) = 1/(x +y)
For the denominator to be zero,
x = -y
or y = -x
So the expression is defined for all the real values except x = -y , y = -x
It can be written as
E = {x ∈ R ∧ x ≠ -y} or
E = {y ∈ R ∧ y ≠ -x}
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