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Solution 4.2:3b
From Förberedande kurs i matematik 1
Revision as of 07:48, 9 October 2008 by Tek (Talk | contribs)
The angle 2 corresponds to a whole revolution and therefore we see that if we draw in a line with angle 2 relative to the positive x-axis, we will get the positive x-axis.
Because cos2 is the x-coordinate for the point of intersection between the line with angle 2 and the unit circle, we can see directly that cos2=1.
