Properties Of Triangles

If the angles \(\mathrm{A}, \mathrm{B}\), and \(\mathrm{C}\) of a triangle are in an Arithmetic Progression and if \(\mathrm{a}, \mathrm{b}\) and \(\mathrm{c}\) denote the lengths of the sides opposite to A, B and C respectively, then the value of the expression \(\frac{\mathrm{a}}{\mathrm{c}} \sin 2 \mathrm{C}+\frac{\mathrm{c}}{\mathrm{a}} \sin 2 \mathrm{~A}\) is