x^2 + 1/x^2 - 3 in the form of factors is : 1. (x - 1/x)(x + 1/x) - 1 2. (x + 1/x + 1)(x - 1/x - 1) 3. (x -1/x)(x - 1/x - 1) 4. (x - 1/x + 1)(x - 1/x - 1)