Heat And Thermodynamics

The molar specific heat of an ideal gas at constant pressure and constant volume is \(\mathrm{C}_{\mathrm{p}}\) and \(\mathrm{C}_{\mathrm{v}}\) respectively. If \(\mathrm{R}\) is universal gas constant and \(\gamma=\frac{\mathrm{C}_{\mathrm{p}}}{\mathrm{C}_{\mathrm{v}}}\) then \(\mathrm{C}_{\mathrm{v}}=\)