: , , .
. , , sin(t) cos(t). (). , .
.
, f(t) t , ¹ 0, ,
f(t + ) = f(t) t (¥ < t < + ¥).
, , sin t cos t = 2p.
"" ( " ")
g(t) = A sin(wt + j), ¥ < t < + ¥.
g(t + ) = g(t), ¥ < t < + ¥, = . , w j , .
.
k = 1, 2, , ¥ < t < + ¥ (1)
k- k = 1, 2, .
, (1) . . w = . , w = 1. , , .
k = 1, 2, .
, , , ,
(2)
,
= 2p.
(2) .
,
Aksin (kx + jk) = Aksinjk coskx + Akcosjk sinkx.
, ak = Aksinjk , bk = Akcosjk.
(2)
. (3)
. (3) , (3), , f(x) .
:
1) (3)?
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2) (3) 0, k bk, ?
3) (3) f(x)?