3826: reverse tan double angle
3821: simplify trig to exp and vice versa

recognizing I*tan(x) and tanh(x) will take a little more work
factor exptrigsimp out of simplify
update exptrigsimp docs
Merge pull request #30 from sn6uv/exptrigsimp

factor exptrigsimp out of simplify
edit docstring
Merge branch 'master' into trig
exptrigsimp recognizes tan and tanh
use TR2i to do -> tan/tanh
remove numerical testing scaffolding
document use of simplify in exptrigsimp
edit inline spelling
allow E to rewrite as cos/sin
recognize cosh and sinh in exptrigsimp
unpack uniq generator in solve
make sure free_symbols of RootOf is set()

Both RootOf __new__ and _new can allow poly to become something other
than a PurePoly instance. Since RootOf only supports
univariate polynomials there should never be any free symbol returned.
use set flag to generate set results in docstring
Merge pull request #2129 from smichr/roots

handle generator in solve, RootOf.free_symbols, solve docstring
reposition exptrigsimp and edit docstrings
Merge pull request #2117 from smichr/trig

trigsimp and simplify