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Article #73

Trigonometrie Beweise

#73
From: Horst Miller
Date: Sun, 25 May 2003 13:15
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Hallo,
kann mir jemand sagen, wie mal folgende Aussagen beweisen kann:

1.) sin? + sin? + sin? = 4 * cos(? : 2) * con(? : 2) * cos(? : 2)

2.)  sin2? + sin2? + sin2? = 4 * sin? + sin? + sin?

3.) sin�? + sin�? + sin�? = 2 * cos? * con? * cos? + 2

So, das waren sie, kann mir da irgendjemand helfen, ist wirklich dringend
und ich habe �berhaupt keine Idee, wie ich das beweisen kann,
im Voraus vielen Dank,
MfG
Horst
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From: "Horst Miller" <Necro_X@gmx.net>
Newsgroups: bln.sci.mathematik
Subject: Trigonometrie Beweise
Date: Sun, 25 May 2003 15:15:43 +0200
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