# Need help from expert

1. Nov 10, 2006

### kevin_obl

Hi, Just got some question with some function.. which I'm not really sure about the answer!!

Question as below

Is that the right way to present the signal???

For f(t-2)

For f(2-t)

For f(-t)

2. Nov 10, 2006

### chroot

Staff Emeritus
A sine wave in the time domain has a delta function representation in the frequency domain. The height of the delta function is related to the amplitude of the sine wave; the position along the frequency axis is related to the frequency of the sine wave. Obviously, smaller period implies higher frequency.

The answers to question 2 appear to be correct.

- Warren

3. Nov 10, 2006

### kevin_obl

Am I doing it wrongly?? Since the amplitudes are given as 0.5 for part a) and part c) and 1 for part b).. That's why I just wrote them on the frequency domain.
Is that any possible way for you to show me something in picture?? Thank Alot for your help.. Appreciated

4. Nov 12, 2006

### kevin_obl

Anyone here know how to add and multiply two function together??

Question Part1

Question Part2