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Solution 4.2:5b
From Förberedande kurs i matematik 1
Revision as of 08:04, 29 September 2008 by Ian (Talk | contribs)
If we draw the angle
225= 180+ 45
on a unit circle, we see that it makes an angle of
45
with the negative
x
-axis.
This means that
tan 225, which is the gradient of the line that makes an angle of
45
with the positive
x
-axis, equals
tan 225, because the line which makes an angle of
45
has the same slope:
= 180
21
