The Fourier transform of a function \(f(at)\) is given by
Show Hint
The Time Scaling Property of Fourier Transform is
\[
f(at)
\;\xleftrightarrow{\mathcal F}\;
\frac{1}{|a|}
F\!\left(\frac{\omega}{a}\right).
\]
Time compression causes frequency expansion, while time expansion causes frequency compression.