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A useful technique for calculating the value of a trigonometric function for angles that don't lie between 0 and 2 is to use the unit circle. If we draw a line which starts at the origin and makes a certain angle relative to the positive part of the x-axis, we can see that the cosine of that angle is the x-coordinate of the point of intersection between the line and the unit circle. In the same way, the sine of the angle is the y-coordinate of the intersection point.
2
−
=−1 
