`(x^2+1)/(x^2-2)` or `yx^2-2y= x^2+1` or `x^2=(2y+1)/(y-1)` Now `x^2 ge 0 rArr (2y+1)/(y-1) ge 0` Now `x^2 ge 0 rArr (2y +1)(y-1) le 0` `rArr y le -1//2 or y gt 1`
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