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# C3 Trigonometry Question watch

2. (Original post by Narik)

use cot^2=cosec^2x-1
3. (Original post by rbnphlp)
use cot^2=cosec^2x-1
Is that in C3?

4. Substituting this in:

When you simplify this now, you'll get a quadratic.
And then if you can work out , you can find and then itself hopefully!
5. (Original post by Narik)
Is that in C3?
Probably.
Annoying as it is, it depends which specification you do
So which one eez eet?
6. (Original post by Narik)
Is that in C3?
it is ..you should be familiar with identites to solve problems like this,
7. Oh yeah! Of course it is. I totally forgot about that identity. Thanks guys!
8. (Original post by Narik)
Oh yeah! Of course it is. I totally forgot about that identity. Thanks guys!
No problem; out of interest, how many solutions were there in the end?
9. (Original post by placenta medicae talpae)
No problem; out of interest, how many solutions were there in the end?
There were 4:
45*, 116.7*, 225* and 296.6*

Thanks for the help.
10. (Original post by Narik)
There were 4:
45*, 116.7*, 225* and 296.6*

Thanks for the help.
Ooh, interesting!
Hmm, I think there's a way to do degree-symbols.
I'll investigate

No problem
11. Ooh - it's ^\circ in LaTeX:

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