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Lösung 4.3:2b

Aus Online Mathematik Brückenkurs 1

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Version vom 15:02, 22. Okt. 2008

If we write the angle 57 as

57=55+2=+52

we see that 75 is an angle in the third quadrant.

The angle between 0 and which has the same x-coordinate as the angle 75, and hence the same cosine value, is the reflection of the angle 75 in the x-axis, i.e.

v=−52=53.
Von „http://wiki.sommarmatte.se/wikis/2009/bridgecourse1-TU-Berlin/index.php/L%C3%B6sung_4.3:2b“