3 A periodic function f(t) is said to be half-wave symmetry iff(0=f(++1/2) n=2,4,6 0 =1,3,5..an=0 b.=03 A periodic function f (t) is said to be half-wave symmetry if f(t)= -f(t+T/2). n=2,4,6….    = = 0 0 n n b a n=1,3,5... an = 0