We have (d^(2)y)/(dx^(2))+(rhow^(2))/(T)y=0Thus, y=c_(1)cos sqrt((rhow^(2))/(T))x+c_(2)sqrt((rhow^(2))/(T))xFrom y(0)=0 we get c_(1)=0And y(1)=0 implies 0=0*cos sqrt((rhow^(2))/(T))L+c_(2)sin sqrt((rhow^(2))/(T))L=>c_(2)sin sqrt((rhow^(2))/(T))L=0For nontrivial solution c_(2)!=0, so ... See the full answer