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I have to use Parseval's Theorem. I used it and ended with the integral of $(\operatorname{sinc}^2(kt))^2$. I know the Fourier Transform of $\operatorname{sinc}^2(kt)$ is the triangle function but I don't know how is the triangle function in frequency domain.

If someone can tell me how to solve this problem I will be grateful.

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    https://see.stanford.edu/materials/lsoftaee261/PS-5-2007-Solutions.pdf Refer this site for detailed solution2017-03-14

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