Trigonometrie

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	== doppelte und halbe Winkel ==		== doppelte und halbe Winkel ==
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		+	<math>\sin 2 \alpha = 2 \sin\alpha\, \cos\alpha</math>
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		+	<math>\cos 2 \alpha = \cos^2\alpha 2 - \sin^2\alpha = 2 cos^2\alpha - 1 = 1 - 2 \sin^2\alpha</math>
	[[category:Mathematik]]		[[category:Mathematik]]

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Revision as of 21:26, 16 September 2008

trigonometrische Äquivalenzen

Additionstheoreme

doppelte und halbe Winkel