---

s(t) = A cdot sin left(2 cdot %pi cdot f cdot t right)
newline
A = 1, ~~ f = 500 ~ "Гц"
newline
s(t) = sin left(2 cdot %pi cdot 500 cdot t right)
newline
f_d = 4 cdot f = 4 cdot 500 = 2000 ~ "Гц"
newline
%DELTA t = {1} over {f_d} = {1} over {2000} ~ "с" = 0,0005 ~ "с" = 0,5 ~ "мс"
newline
T = {1} over {f} = {1} over {500} ~ "с" = 0,002 ~ "с" = 2 ~ "мс"
newline
t_n = {n} over {f_d} = {n} over {2000} ~ "с"
newline
s_n = sin left(2 cdot %pi cdot 500 cdot {n} over {2000} right) = sin left({%pi cdot n} over {2} right)