From Förberedande kurs i matematik 2

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-	{{NAVCONTENT_START}}	+	At those points where the graph of the function has a horizontal tangent (gradient equal to zero), the derivative is zero.
-	<center> [[Bild:_1_1b.gif]] </center>	+
-	{{NAVCONTENT_STOP}}	+	{| align="center"
		+	||{{:1.1 - Figure - Solution - The graph of f(x) in exercise 1.1:1 with horizontal tangents}}
		+	|-
		+	||<small>The graph of ''f''(''x'') has horizontal tangents<br> at ''x''&nbsp;=&nbsp;-3 and ''x''&nbsp;=&nbsp;2</small>
		+	|}
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		+	In the figure, we see that this happens when <math>x=-3</math> and <math>x=2\,</math>.

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Current revision

At those points where the graph of the function has a horizontal tangent (gradient equal to zero), the derivative is zero.

The graph of f(x) has horizontal tangents at x = -3 and x = 2

In the figure, we see that this happens when \displaystyle x=-3 and \displaystyle x=2\,.