`to_poly_solve` inconsistency of solutions for equivalent forms of goniometric equations

Appending 'simpfuncs = ['expand] helps somewhat; try  to_poly_solve(sin(x)/cos(x) = 1, x, 'simpfuncs = ['expand]);

I made no particular effort to make to_poly_solve (usually) find syntactically identical solution sets to semantically identical equations. That simply
wasn't a design goal. Although it might seem easy to do write a pre-processor that would do things such as sin(x)/cos(x) --> tan(x), it's not so
easy to do this in a way that doesn't make some answers much much more complicated, or to do it without introducing spurious solutions.

 Most days, I'm happy when nobody locates an abject bug in to_poly_solve :)

Thanks for the interest in to_poly_solve.

--bw

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