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# Finding exact values for trigonometric functions

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1. (d) Hence find the exact values of for .
Any ideas for part d?
2. (Original post by Ano123)

(d) Hence find the exact values of for .
Any ideas for part d?
Solve the quartic given in the question.
3. How do you suppose I do that? It won't factorise nicely.
4. If you let then you get the quartic when .

So find the solutions of that.

For d) Find what the sum of the squares of the roots is. Use

You might also need to convert some of the roots from c) so you answer d)

Hope that helps
5. (Original post by Math12345)
If you let then you get the quartic when .

So find the solutions of that.

For d) Find what the sum of the squares of the roots is. Use

You might also need to convert some of the roots from c) so you answer d)

Hope that helps
It's only part d that is the trouble.

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