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# C3 trig addition formulae equation

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1. I am trying to solve for theta but have ended up with this. What am I supposed to do now?

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2. (Original post by jessyjellytot14)

I am trying to solve for theta but have ended up with this. What am I supposed to do now?

Posted from TSR Mobile
Divide both sides by cosine to get
3. (Original post by jessyjellytot14)

I am trying to solve for theta but have ended up with this. What am I supposed to do now?

Posted from TSR Mobile
On line 2:

I think you can take it from here
4. (Original post by RDKGames)
Divide both sides by cosine to get
the way it was simplified at the end would give a as well
5. (Original post by 123Master321)
the way it was simplified at the end would give a as well
No it wouldn't. I assume OP notices the mistake of forgetting the brackets. Otherwise, that is something she would quickly realise.
6. (Original post by RDKGames)
No it wouldn't. I assume OP notices the mistake of forgetting the brackets. Otherwise, that is something she would quickly realise.
Oh yh my bad, I just assumed the working was right and it got simplified poorly
7. (Original post by RDKGames)
Divide both sides by cosine to get
(Original post by 123Master321)
On line 2:

I think you can take it from here
I tried both of these methods and they both got the same answers
8. (Original post by jessyjellytot14)
I tried both of these methods and they both got the same answers
That's because these aren't different methods.
9. (Original post by RDKGames)
That's because these aren't different methods.
I know but the first method doesn't involve factorising so they look slightly different when written down.

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