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Solution 4.2:4e
From Förberedande kurs i matematik 1
Revision as of 13:23, 28 September 2008 by Ian (Talk | contribs)
we see that the angle
67
on a unit circle is in the third quadrant and makes an angle
6
with the negative
x
-axis.
Geometrically,
tan67
is defined as the gradient of the line having an angle
67
and, because this line has the same slope as the line having angle
6, we have that
6cos
3=1
3
