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Solution 4.2:4d

From Förberedande kurs i matematik 1

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m (Lösning 4.2:4d moved to Solution 4.2:4d: Robot: moved page)
Current revision (10:37, 9 October 2008) (edit) (undo)
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If we use the unit circle and mark on the angle <math>\pi</math>, we see immediately that <math>\cos \pi = -1</math> and <math>\sin \pi = 0\,</math>.
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<center> [[Image:4_2_4d.gif]] </center>
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[[Image:4_2_4_d.gif|center]]
[[Image:4_2_4_d.gif|center]]
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Thus,
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{{Displayed math||<math>\tan \pi =\frac{\sin \pi }{\cos \pi }=\frac{0}{-1}=0\,\textrm{.}</math>}}

Current revision

If we use the unit circle and mark on the angle , we see immediately that cos=1 and sin=0.

Thus,

tan=sincos=01=0.