i believe that it is -1 and -1 or 1 and 1
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Any two numbers whose product is '1' are each others' reciprocals.
well let's see, 1x1=1 so one of the two numbers whose product is one. =========================== I think you are looking for the word "reciprocal."
1 x 1 = 1
One such set is {-4, 5}.
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