# Fourier Transform question F o sin(10t)

1. Jun 25, 2009

### priscared

Fourier Transform of sin(10t)

Hi all,
Can some1 explain how to get the complex fourier transform of sin(10t)

I understand how to steal it off a fourier transform table, but i have no idea how to do it manually.

Any help anyone?
Cheers

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2. Jun 25, 2009

### daviddoria

The Fourier transform of a pure tone (the sine function) is two delta function, one at $$+\frac{10}{2\pi}$$ and the other at $$-\frac{10}{2\pi}$$ (I could have my $${2\pi}$$'s wrong). The last part of this question should be a simple sampling in the frequency domain of the transform of the function in part A.

3. Jun 26, 2009

### priscared

yeah i was way off. Thanks for the clarification

4. Jun 26, 2009

### priscared

Hi,
When answering question above, you stated the need "The last part of this question should be a simple sampling in the frequency domain of the transform of the function in part A."

I believe i have the right rule attached.

e^(j 2pi fc t)g(t) <-> G(f-fc) (this formula is attached in jpeg)

So, once i find the Fourier transform of the first function. I simply need to shift it by fc.

I have had a go at it, i think its right. (answer attached)

If you could point me in the right direction, that'd be great. cheers

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