Find the solution of the partial Differential equation (D^2-D^1^2) z=0? A) z=Φ1(x-y) +Φ2(x-y) B) z=Φ1(x+y) +Φ2(x+y) C) z=Φ1(x-y)-Φ2(x-y) D) z=Φ1(x+y) +Φ2(x-y)
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