18:30 90 T) f (c) = — + E (an cos na + bn sin nc) O, …...f (c) = — + E (an cos na + bn sin nc)...
2
18:30 90 T) f (c) = — + E (an cos na + bn sin nc) O, …...f (c) = — + E (an cos na + bn sin nc) O, bn(n = 1, 2, f@) cos nadc f (c) sin ncdc b, (X.) an, (1) l) an (n = 2 c e e
