Gebruiker:Martinvl/Fibonaccireeks: Verskil tussen weergawes
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Lyn 98:
=== Sferiese spirale ===
Die oppervlak van 'n sfeer, radius <math>r</math>, kan voorgestel word deur die volgende vergelykings:
|url = mathcurve.com/courbes3d.gb/clelie/clelie.shtml |title = Clelia
|first1 = Robert
|last1 = Ferréol
|first2 = Jacques
|last2 = Mandonnet
|publisher = mathcurve.com
|year = 2018
|language = English}}</ref>
[https://mathcurve.com/courbes3d.gb/clelie/clelie.shtml citation]: <math>
\begin{array}{cll}
x &=& r \cdot \sin \theta \cdot \cos \varphi \\
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</math>
* <math>
\begin{array}{cll}
x &=& r \cdot \sin \theta \cdot \cos
y &=& r \cdot \sin \theta \cdot \sin
z &=& r \cdot \cos \theta\qquad \qquad 0\le\theta\le \pi \ .
\end{array}
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