∑ (20+1)xm C sin 9o-2oW Cos aT- hwo sin ar R=1 f(τ)(0<x<矶) Cn=f(x)5n2d=(m+1)() ,22 (n+1)22a u(o,t;r)=∑ f(τ)e ](q) (20+1)x t=0 (2+1)丌 X Sin