Find the general solution for...

Re: Find the general solution for...

Quote:

Originally Posted by

**Educated** I'm having a bit of trouble solving this trig problem:

At first when I looked at it it seemed easy but as I tried to solve it, it got really confusing and I got stuck on the

part.

Here's what I did:

Double angle formula:

Double angle formula:

Now I can get the general solution for the

part but what about the

part? How would I solve that?

EDIT: Sorry I just realised I placed this in the wrong section :/

Can a mod please move it to the trig section?

You won't be able to solve using analytical methods. You will need to use technology.

Re: Find the general solution for...

Actually, seems to satisfy .

Re: Find the general solution for...

Quote:

Originally Posted by

**BAdhi** Actually,

seems to satisfy

.

Yes, that's true. However, if you are not a very good guesser, technology would be the way to go :)

Re: Find the general solution for...

This was an old exam question so we're not allowed to use technology to solve it, just our brains.

Although I guess you can guess one solution by trial and error for the cubic where and try to derive the other solutions from it by factoring.

Thanks for the help!

Re: Find the general solution for...

Therefore, .

where k is some integer.

Re: Find the general solution for...