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JRG wrote:
> Surely the math involved is the same (I can't understand why people are
> frightened by the simplest trig formulae).
Must be the same, since both show the same problem, i.e. books standing more or
less upright when they should be sliding. I guess that a complete book macro
would have to take into account factors like mass or friction, and I agree that
trace() doesn't give a solution. But overall, it looks nice enough to be useful.
G.
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