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n = 3 would make the denominator zero. And since the numerator is clearly non-zero, that means the expression is undefined.
no, having a zero in the denominator makes it undefined.
The restricted value in the domain is x=-2 because if x were equal to -2, the denominator would be 0 and the expression would become undefined.
The rule says no dividing by zero. So it is undefined.
pi
No, it is 0.