Lösung 4.3:3e
Aus Online Mathematik Brückenkurs 1
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Version vom 15:03, 22. Okt. 2008
The angle \displaystyle \pi/2+v makes the same angle with the positive y-axis as the angle v makes with the positive x-axis, and hence we see that the x-coordinate for \displaystyle \pi/2+v is equal to the y-coordinate for v, but with a change of sign, i.e.
| \displaystyle \cos \Bigl(\frac{\pi}{2}+v\Bigr) = -\sin v = -a\,\textrm{.} |
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| Angle v | Angle π/2 + v |
