\fracx^2 + 1x^2 - 1 + \fracx^2 - 1x^2 + 1 = \frac(x^2 + 1)^2 + (x^2 - 1)^2(x^2 - 1)(x^2 + 1) = \frac2x^4 + 2x^4 - 1 = 2 \cdot \fracx^4 + 1x^4 - 1 - Veritas Home Health