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rect (t/2) = 2 sinc (w)

T=3:

f(t+3)+f(t-3) <=> 4 sinc (w) cos 3w

I don't understand how "4 sinc (w) cos 3w" comes in the final answer. Is there any step missing?

Thanks.

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# Homework Help: Little query regarding Fourier Transform.

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