Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 2012-12-01 00:19:33
- unlucky guy
- Guest
proving identities
my teacher is evil and won't explain everything. he wants brides and stuff like that... he gave only one easy example about trigonometric function and gave 48 exercises as a homework including problems.
please can u help me with this one...
prove that sin t + sec t = tan t is not an identity. and please with little bit more explanation about how you solving
#2 2012-12-01 00:42:43
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: proving identities
Hi unlucky guy;
One of the easiest ways is to find an obvious counterexample:
so sec(0) is 1 / 1 because cos(0) is 1.
because
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 2012-12-01 01:02:59
- unlucky guy
- Guest
Re: proving identities
thanks 
#4 2012-12-01 01:06:34
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: proving identities
Hi;
Please let me know what your evil teacher thinks of it. He sounds like a moderator I know on another forum. If they are the same, he will absolutely hate my answer...
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 2012-12-01 03:11:51
- unlucky guy
- Guest
Re: proving identities
no he isn't 
im sure
#6 2012-12-01 08:17:35
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: proving identities
Hi;
Okay, good luck then and welcome to the forum.
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