(a) f(x)=cc1, & -L <= x<0, 0, & 0 <= x com f(x+2 L)=f(x). Res: f(x)=12-2pi sumn=1^infty sin [(2 n-1) pi x / L]2 n-1.
(b) f(x)=cx+1, -1 <= x<0, 1-x, 0 <= x<1 ; com f(x+2)=f(x). Res: f(x)=12+4pi^2 sumn=1^infty cos [(2 n-1) pi x](2 n-1)^2.

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