How does the unit circle allow the trigonometric functions to be defined for all real numbers instead of just for acute angles?
1 answer:
Every point in the unit circle is identified either by its coordinates or by the angle it forms with the x-axis,
.
The trigonometric functions associate with every angle and the correspondant
coordinates the two values
This procedure can be done for every angle , so you don't have to work with acute angles only.
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