bharat bajaj12 Years agoLength : root ( dy^2 + dx^2) and then its integral..dL = dx * root (dy/dx^2 + 1)dL = dx * root ( x^4 + 2x^2 + 1)dL = dx * (x^2 + 1)Integrate it and now put the limits. This is the answerThanksBharat Bajajaskiitians facultyIIT Delhi