From Förberedande kurs i matematik 1

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-	{{NAVCONTENT_START}}	+	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>.
-	<center> [[Bild:4_2_4d.gif]] </center>	+
-	{{NAVCONTENT_STOP}}	+	[[Image:4_2_4_d.gif|center]]
-	[[Bild:4_2_4_d.gif]]	+
		+	Thus,
		+
		+	{{Displayed math||<math>\tan \pi =\frac{\sin \pi }{\cos \pi }=\frac{0}{-1}=0\,\textrm{.}</math>}}

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Current revision

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

Thus,

\displaystyle \tan \pi =\frac{\sin \pi }{\cos \pi }=\frac{0}{-1}=0\,\textrm{.}