The $60-$mm$-$diameter solid shaft is made of $2014-$T$6$ aluminum and subjected to the distributed of $2$ kN$$m and concentrated torsional loadings shown at location $0\mathrm{.}4$ on the shaft $,$T$=1\mathrm{.}75$kN$$m$,$ shaft total length is $1$m lg

Determine the magnitude of the angle of twist at the free end A of the shaft.