Calculation: BYsHzT - 1

V_2  = 
 V_1* (1+ β* Δ_t)
V_2 =  V_1* (1+ β* Δ_t)V_2 = V_1*(1+β*Δ_t)
V_2 = V_1+ Δ_t* β* V_1V_2 = V_1+Δ_t*β*V_1
V_2 = V_1+ V_1* Δ_t* βV_2 = V_1+V_1*Δ_t*β