![p=slider([0,pi])](formula2.png){kind=small}
Solid angle.
To do:
(i) Funkier surfaces.
(ii) Fix P(theta) issue?
Can't get it to recognize (any variation on) this [:-(]:
![function(P,T,P)=p+a*cos([W*T])-P](formula7.png){kind=small}
![phi=p+a*cos([W*theta])](formula9.png){kind=small}
![r=1.01,phi<p+a*cos([W*theta])](formula10.png){kind=small}
![a=slider([0,0.2])](formula11.png){kind=small}
![W=slider([0,10,10])](formula12.png){kind=small}
Author: David A. Craig <http://web.lemoyne.edu/~craigda/>
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