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# Further trigonometry identities

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This presentation shows how sum and difference of angles formula are derived. It also features doubled-angled formula and other trigonometry formulas.

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### Further trigonometry identities

1. 1. Further Trigonometry Identities<br />Multiple Angles<br />
2. 2.
3. 3.
4. 4.
5. 5.
6. 6.
7. 7.
8. 8.
9. 9. Solve the following equations for the angles between 0° and 360° inclusive<br />
10. 10. Simplifying trigonometryas <br />
11. 11. Expand it as sum of angles<br />By association<br />taking R positive<br />
12. 12. where<br />and<br />are positive<br /> is acute<br />
13. 13.
14. 14. Further Trigonometry Identities<br />FACTOR FORMULAE<br />
15. 15.
16. 16.
17. 17.
18. 18.
19. 19.
20. 20. Express the following as a product of trigonometrical functions:<br />
21. 21. Prove that <br />