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# I've got urgent maths problem

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Why bother with a post grad course - waste of time? 17-10-2016
1. Any maths whizz here?

The topics are periodicity (trig) , fourier tranformation, and power energy.
2. (Original post by LostGear)
Any maths whizz here?

The topics are periodicity (trig) , fourier tranformation, and power energy.
Maths wizz checking in
3. (Original post by Slowbro93)
Maths wizz checking in
Haha yay!

I have got a few questions, but you don't need to answer them all

Periodicity
1. Find the period of x(t) = 2 |cos t|
2. Find the period of x(t) = 8 cos 2 t

Power energy
3. Find the energy of x(t) = e -at u(t)

4. Find the power of the signal

Fourier Transform

5. Obtain the Fourier transform of the function f(t) = cost + 2cos4t

6. Obtain the Fourier transform of the function f(t) = sint cos2t

7. Obtain the Fourier transform of the function f(t) = cos 2 t
4. (Original post by LostGear)
Haha yay!

I have got a few questions, but you don't need to answer them all

Periodicity
1. Find the period of x(t) = 2 |cos t|
2. Find the period of x(t) = 8 cos 2 t

Power energy
3. Find the energy of x(t) = e -at u(t)

4. Find the power of the signal

Fourier Transform

5. Obtain the Fourier transform of the function f(t) = cost + 2cos4t

6. Obtain the Fourier transform of the function f(t) = sint cos2t

7. Obtain the Fourier transform of the function f(t) = cos 2 t
Do you understand what periodicity is? For example, what is the periodicity for f(x)=sin(x)

And what do you mean about Power signal?
5. (Original post by Slowbro93)
Do you understand what periodicity is? For example, what is the periodicity for f(x)=sin(x)

And what do you mean about Power signal?
2pi? Periocity is when a function repeats over and over again. In your example, the function f(X) = SIN(X) repeats 2pi?

6. (Original post by LostGear)
2pi? Periocity is when a function repeats over and over again. In your example, the function f(X) = SIN(X) repeats 2pi?

Well by definition, a function has a period a when

So how can this be applicable?

In addition, what have you tried in terms of working out?
7. (Original post by Slowbro93)
Well by definition, a function has a period a when

So how can this be applicable?

In addition, what have you tried in terms of working out?

I would appreciate if you could help me with the fourier transform questions
8. (Original post by LostGear)

I would appreciate if you could help me with the fourier transform questions
Right, do you know what the equation for a fourier transform is? Let's start from there

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