Can anybody solve this?

Consider the initial boundary value problem for the wave equation in 2 = {(1,y); 2 >0}R? azu = Au for (x, y,t) 12,t> 0 ou (1, y, t) = 0 for (z,y,t) 222, t > 0 u(x, y,0) = (x, y) for (x,y) E2 au(x, y,0) = 0 for (x,y) EN Draw the domain of dependence for (x, y, t) = (1,0, 2) (on {(1;y,0)}). Consider the initial boundary value problem for the wave equation in 2 = {(1,y); 2 >0}R? azu = Au for (x, y,t) 12,t> 0 ou (1, y, t) = 0 for (z,y,t) 222, t > 0 u(x, y,0) = (x, y) for (x,y) E2 au(x, y,0) = 0 for (x,y) EN Draw the domain of dependence for (x, y, t) = (1,0, 2) (on {(1;y,0)})