I'm currently studying for an exam, and I'm not sure the textbook's answer for the fourier transform of 3sinc^2(60πt) is correct. For this question, I incorporated the duality property.
Below is my working so far:
Our class are given a formula sheet with the following identity which i incorporated into my working along with the duality property:
From the textbook answers, the answer said the fourier transform of 3sinc^2(60πt) is 1/20*Δ(ω/240π).
The answer looks similar to mine, so I can't be too far off...
Cheers