And as the spectrum of a discrete time sign, this exact same spectrum will periodically repeat if we extended the frequency increased beyond $f_s$ this kind of 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 $n$. https://2bhkflatrentingurugram.blogspot.com/2025/07/book-spacious-boys-pg-in-sector-15-part.html