Consider two AC voltage sources connected in series with voltages V 1 = V 1 , max sin(2ft) and V 2 = V 2 ,

Consider two AC voltage sources connected in series with voltages V₁ = V₁, max sin(2πft) and V₂ = V₂, max sin(2πft p/4), and V₁, _max V_2, max 30 V. Show that these two sources in series are equivalent to a single source with V_series = V_equiv sin(2πft + ϕ) and find the values of V_equiv and f.