And because the spectrum of the discrete time sign, this exact spectrum will periodically repeat if we extended the frequency bigger outside of $f_s$ this sort of that the spectrum proven can be precisely the same spectrum in each and every frequency band from $nf_s$ to $(n+1)f_s$ for any integer https://boyspgingurugramsector14.blogspot.com/2025/07/book-affordable-1-rk-for-rent-in.html