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Lösung 4.3:4d

Aus Online Mathematik Brückenkurs 1

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With the formula for double angles and the Pythagorean identity cos2v+sin2v=1, we can express cos2v in terms of cosv,

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Von „http://wiki.sommarmatte.se/wikis/2009/bridgecourse1-TU-Berlin/index.php/L%C3%B6sung_4.3:4d“