It's nasty to express ϑ in terms of the other variables, but can anyone explain why? It's bugging me! It's just trig!pic.twitter.com/kzZ5nEHynB
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@increpare dunno, I get t = sqrt(c^2 + x^2) (b - x) sin beta / (x + c sin beta) when I try to solve for the x-coordinate of that right angle
@increpare and it seems to be quartic in x if you square things, so not surprising that the solution to that is a mess if that's what it is
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