A₁ 0≤t≤T/2 f(t) = -Ao T/2≤1≤T f(t)=Σ n=1 4A0 (2n-1)л) sin (2л (2n-1)t\ T f(t) 1 A M 0 -1 0 0.25 0.5 0.75 t (−1 −T/2<t< -T/4 f(t)=1-T/4<t< T/4 -1 T/4<t< T/2 = = 27 f(t) cos(kwot) dt 1- -T/4 -T/2 cos(kwot) dt + T/4 cos(kw₁t) dt-cos(kwot) Pot) di] T12 dr -T14 T74 4/(kл) for k 1, 5, 9,... ak -4/(kn) for k 3, 7, 11, … … … 0 for k = even integers (a) ак ak = = f(t)cos(k f(t)cos(kwot) dt