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2-Calculate a finite-difference solution of the equation OU ²U at x²³ 0<x</2.1>0₁ U=0 when t=0 for 0≤x≤ 1, satisfying the initial condition and the boundary condition au = -= 0 at x =0 at x = 0 and ax อย dx 1 at x = for 1>0, i) Using an explicit method with ox=0.1 and r=- for two time-steps. ii) Using the Crank-Nikolson equations with 6x=0.1 and r=1 for two time-steps.