two *(-x^ two /(x^ two + one) + one)/(x^ two + one) = zero
2 multiply by ( minus x squared divide by (x squared plus 1) plus 1) divide by (x squared plus 1) equally 0
two multiply by ( minus x to the power of two divide by (x to the power of two plus one) plus one) divide by (x to the power of two plus one) equally zero
2*(-x2/(x2 + 1) + 1)/(x2 + 1) = 0
2*-x2/x2 + 1 + 1/x2 + 1 = 0
2*(-x²/(x² + 1) + 1)/(x² + 1) = 0
2*(-x to the power of 2/(x to the power of 2 + 1) + 1)/(x to the power of 2 + 1) = 0
2(-x^2/(x^2 + 1) + 1)/(x^2 + 1) = 0
2(-x2/(x2 + 1) + 1)/(x2 + 1) = 0
2-x2/x2 + 1 + 1/x2 + 1 = 0
2-x^2/x^2 + 1 + 1/x^2 + 1 = 0
2*(-x^2 divide by (x^2 + 1) + 1) divide by (x^2 + 1) = 0