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this is the same right?

Domain is (-∞,0) U (0,+∞)

and

Domain D: {XER, x ≠ 0}

and this is the same right?

Domain is (-∞,0) U (5,+∞)

and

Domain D: {XER, x ≠ 0, x≠ 5}

Attempt :

I know that U is used to connect functions,

I'm asking this here since I couldn't find notation online