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I know. Someone asked the same question previously and I was ed too. _________________
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If rs=1, then (r,s) = (1,1) or (-1,-1). For both cases, r^2 and s^2 = 1.
Wilfred, if I were you and could assume x,y are integers then its obvious they are either 1,1 or -1,-1 in that case, I would not have to do the 1/2 pg long calculations to figure out that the ans is indefinite! The Dr contains (x-y)^2, which is obviously zero and hence the expression infinite!!!!!