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Solution 4.3:1a
From Förberedande kurs i matematik 1
Revision as of 11:44, 12 September 2008 by Ian (Talk | contribs)
If we draw the angle
5
on a unit circle, then it will have an
x
-coordinate that is equal to
cos5
.
FIGURE 1 FIGURE 2
the line
x=cos5x=cos5
In the figures, we see also that the only other angle between
0
and
2
which has the same cosine value, i.e. same
x
-coordinate, is the angle
v=−5+2=59
on the opposite side of the
x
-axis.
5