Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 2016-04-26 04:35:42
- Thuhina
- Member
- Registered: 2016-04-26
- Posts: 7
Trigonometry-CD equations
"Cos(A-B) - Cos(A-B) = 2SinASinB"
I saw this equation on this site. But it is quite different from what i learned in the class. What i lerned was this. "Cos(A-B) - Cos(A+B) = 2SinASinB" which one is correct?
Last edited by Thuhina (2016-04-26 04:39:46)
Offline
#2 2016-04-26 05:58:25
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Trigonometry-CD equations
Hi;
"Cos(A-B) - Cos(A-B) = 2SinASinB is not an identity. It looks like a typo.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#3 2016-04-26 06:02:56
- Thuhina
- Member
- Registered: 2016-04-26
- Posts: 7
Re: Trigonometry-CD equations
Oh thanx a lot! I hope It's better if u correct that. It's misleading.
Offline
#4 2016-04-26 06:04:02
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Trigonometry-CD equations
Where did you see it?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#5 2016-04-26 06:09:50
- Thuhina
- Member
- Registered: 2016-04-26
- Posts: 7
Re: Trigonometry-CD equations
http://www.mathisfunforum.com/viewtopic.php?id=3290 it's in this page.
Offline
#6 2016-04-26 06:14:01
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Trigonometry-CD equations
I have deleted it, thanks for spotting that.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#7 2016-04-26 06:17:05
- Thuhina
- Member
- Registered: 2016-04-26
- Posts: 7
Re: Trigonometry-CD equations
It's still there.
Offline
#8 2016-04-26 06:18:58
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Trigonometry-CD equations
It will take some time to edit. The server is responding very, very slowly right now.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
Pages: 1