. . . , , . .
, . . ( ) .
, , " l " , , ; " V " " " " n " :
l = VT = .
, , .
l, , . , () .
, , , . , ; .
, " S " , " x " , . :
SA = A sinw t. (SA = A cosw t).
j0=w t0, t, " x " . :
S = Acos(wt - j0) = A cos(wt - wt0) = A cosw(t - t0)
S = A sin(wt - j0) = A sin(wt - wt0) = A sinw(t - t0).
t0 = , V - , : S = , S = . V = nl w = 2 pn, :
S =
S = .
, " S " : " t " " x " , S = f1(x,t).
(t1 = const), " x ": St = f2(x), " x " " t1 ". ( ) . () :
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" S " , " x " " t ", . " S " " t " " x ":
, V.. , V . .
(, , ) , .