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Triangles and trigonometry


I'm embarrassed to need help with this, given how trivial it should be,
but ... Does anyone know of a package suitable for solving triginometry
problems such as

(Upper case are angles, lower case is opposite side)

A=12 Degree
a=5
b=17
C<90 Degree

I've written something (which works) using repeated applications of
Solve with the Sin and Cos rules which does the job very badly(!).
However, it doesn't cope with the _generic_ case of _any_ mixture of
(minimally sufficient) information, and I've had to go about the
solution in several steps to get it to work properly.

Mark R Diamond



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