Physics Forums (http://www.physicsforums.com/index.php)
-   Calculus & Beyond Homework (http://www.physicsforums.com/forumdisplay.php?f=156)
-   -   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.

 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?$$U_{n+1}=V_{n}+U_{n}$$ 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.

 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.

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

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.

 All times are GMT -5. The time now is 06:51 AM.