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-   -   Writing a sequence in terms of n. (http://www.physicsforums.com/showthread.php?t=558843)

mtayab1994 Dec10-11 12:13 PM

Writing a sequence in terms of n.
 
1. The problem statement, all variables and given/known data

given: Vn+1=Vn*cos(pi/2^(n+2))

2. Relevant equations

Write a sequence Vn in terms of n

3. The attempt at a solution

we substitute n with n-1 and we get:

V(n-1)+1= Vn-1*cos(pi/2^(n-1+2))

Vn=Vn-1*cos(pi/2^(n+1)

Is this correct?

SammyS Dec10-11 01:23 PM

Re: Writing a sequence in terms of n.
 
Quote:

Quote by mtayab1994 (Post 3661326)
1. The problem statement, all variables and given/known data

given: Vn+1=Vn*cos(pi/2^(n+2))

2. Relevant equations

Write a sequence Vn in terms of n

3. The attempt at a solution

we substitute n with n-1 and we get:

V(n-1)+1= Vn-1*cos(pi/2^(n-1+2))

Vn=Vn-1*cos(pi/2^(n+1)

Is this correct?

Yes: Vn = Vn-1*cos(π/2(n+1)) .

mtayab1994 Dec10-11 01:32 PM

Re: Writing a sequence in terms of n.
 
Alright it was an extra credit question in class just wanted to make sure if it was correct. Thank you very much.

mtayab1994 Dec10-11 01:33 PM

Re: Writing a sequence in terms of n.
 
Off topic question, do u know any good latex software i can't used the stuff given in the forums.

SammyS Dec10-11 01:44 PM

Re: Writing a sequence in terms of n.
 
I mostly use the LaTeX from the Forums.

To check my code I sometimes use mimeTeX online.

Do a search in these Forums.

mtayab1994 Dec10-11 01:55 PM

Re: Writing a sequence in terms of n.
 
Alright really appreciate it.

LCKurtz Dec10-11 02:26 PM

Re: Writing a sequence in terms of n.
 
Google Lyx and/or Miktex.

mtayab1994 Dec10-11 02:35 PM

Re: Writing a sequence in terms of n.
 
Quote:

Quote by LCKurtz (Post 3661535)
Google Lyx and/or Miktex.

Yea i have them, but when i type up something in there and I try putting it up in here it comes up all weird.

LCKurtz Dec10-11 03:03 PM

Re: Writing a sequence in terms of n.
 
Quote:

Quote by mtayab1994 (Post 3661553)
Yea i have them, but when i type up something in there and I try putting it up in here it comes up all weird.

Oh, I didn't understand that's what you wanted to do. What problem are you having using the forum TeX tools for the forum?

mtayab1994 Dec10-11 03:10 PM

Re: Writing a sequence in terms of n.
 
Quote:

Quote by LCKurtz (Post 3661592)
Oh, I didn't understand that's what you wanted to do. What problem are you having using the forum TeX tools for the forum?

It's not a 'problem' but sometimes when I want to type something in it doesn't come up how I want it. This is an example with Lyx:

U_{n+1}=V_{n}+U_{n}

LCKurtz Dec10-11 03:17 PM

Re: Writing a sequence in terms of n.
 
Quote:

Quote by mtayab1994 (Post 3661607)
It's not a 'problem' but sometimes when I want to type something in it doesn't come up how I want it. This is an example with Lyx:

U_{n+1}=V_{n}+U_{n}

I'm confused. That is an example of what with Lyx?[tex]U_{n+1}=V_{n}+U_{n}[/tex] displays OK here with tex tags.

mtayab1994 Dec10-11 03:20 PM

Re: Writing a sequence in terms of n.
 
Yea i can't get it to come out like that how can i do it?

LCKurtz Dec10-11 03:23 PM

Re: Writing a sequence in terms of n.
 
You have to enclose tex expressions with tex or itex tags. They are like the $$ or $ tags in regular tex. Right click on the expression to see the source.

[Edit] Woops, that doesn't show the tags. Start to reply with a quote to the post with the tex and you will see the tex tags. It's like this: [tox]Put your tex here[/tox] and use tex instead of tox. (If I use tex you won't see the tags).

mtayab1994 Dec10-11 03:28 PM

Re: Writing a sequence in terms of n.
 
[tex]U_{n+1}=V_{n}+U_{n}[/tex]



alright i got it to work thanx a million!

LCKurtz Dec10-11 03:31 PM

Re: Writing a sequence in terms of n.
 
Yep. You can use itex for inline and you can preview your posts before you submit them to see it's all OK.


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