# Does this identity proof make sense?

• Jun 27th 2013, 02:18 PM
KevinShaughnessy
Does this identity proof make sense?
Hi,

Would anyone mind taking a look at the proof in the link below and telling me if it's correct? It's different from the one in the answer key so I'm not sure if I've done something wrong.

http://i.imgur.com/tcsRvnc.jpg

Thanks!
• Jun 27th 2013, 03:41 PM
topsquark
Re: Does this identity proof make sense?
Quote:

Originally Posted by KevinShaughnessy
Hi,

Would anyone mind taking a look at the proof in the link below and telling me if it's correct? It's different from the one in the answer key so I'm not sure if I've done something wrong.

http://i.imgur.com/tcsRvnc.jpg

Thanks!

Looks good to me. There can be many ways to do these problems so don't worry about the method.

However, "sin" means nothing. You need to put the sin(x) etc. to write these correctly. For example, what would you do if you had a sin(2x)?

-Dan
• Jun 27th 2013, 04:18 PM
Paze
Re: Does this identity proof make sense?
Looks good from here too.
• Jun 27th 2013, 06:20 PM
KevinShaughnessy
Re: Does this identity proof make sense?
Thanks guys!