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Solution 4.2:3b
From Förberedande kurs i matematik 1
Revision as of 11:51, 28 September 2008 by Ian (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.
