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Trigonometry - Further trigonometric identities - half angles (t).
Test Yourself 1.


 

The results required for these further identities are:

Simplifying double angles.    
     
     
     
     
     
     
Identities with double angles.    
     
     
     
Solving equations.

25. Using , solve

3cosx + 5sinx = 5

(0° ≤ A ≤ 360°) to the nearest degree.