Extracted text: 2. Solve the wave equation c2 dy? in two dimensional rectangular region 0 < x="">< l,="" 0="">< y="">< h,="" subject="" to="" the="" initial="" conditions="" du="" (x,="" y,="" 0)="f(x," y)="" u(х,="" у,="" 0)="" —="" 0,="" and="" the="" following="" boundary="" conditions:="" a)="" и(0,="" у,="" t)="" %3="" 0,="" u(l,="" y,="" t)="" 3="" 0,="" u(х,="" 0,="" 6)="" —="" 0,="" и(,="" h,="" €)="" %3d="" 0="" b)="" du="" ди="" u(0,="" y,="" t)="0," u(l,="" y,="" t)="0," (x,="" 0,="" t)="0," dy="" (a,="" h,="" t)="0">