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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)
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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:


tan225 =tan45=sin45cos45=1212=1