$4-97$ The part shown is formed from a $3\mathrm{.}175$ mm diameter steel wire, with $R=63\mathrm{.}500mm$ to and $l=50\mathrm{.}800mm.$ A force is applied with $P=4\mathrm{.}448N.$ Use Castigliano's method to $4-100$ estimate the horizontal deflection at point $A.$ Justify any components of strain energy that you choose to neglect.

Please solve $4-99$ thanks