Little query regarding Fourier Transform.

[Peon666]

Here's a question solved:

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.

 

[LCKurtz]

Here's a question solved:

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

Clearly those are not equal. And what is rect(t/2)?

T=3:

What is T?

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

What is f(t)?

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

Thanks.

The final answer to what? What steps? If you would like people who volunteer their time to give help to answer you, you might take the time to state completely, carefully, and correctly what the problem is.