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Trig Identity
Age 16 to 18
Challenge Level 
 |
In this diagram $O$ is the centre of a unit circle (i.e. a circle with radius 1). Use it to find two trigonometrical relationships between $A$ and $2A$. |
Did you know ... ?
Trigonometrical expressions can often be derived algebraically or geometrically. In more advanced applications the functions of trigonometry are defined as infinite power series rather than geometric ratios.
Trigonometrical expressions can often be derived algebraically or geometrically. In more advanced applications the functions of trigonometry are defined as infinite power series rather than geometric ratios.
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