Rewriting the univariate solvers
changed some ValueError to NotImplementedError
solve_univariate: removed simplify call
added _is_function_class_equation method
untrack test_solve_univariate_imported
[skip_ci]
solve_univariate: fix doctests
[skip_ci]
_is_function_class_equation: added tests
un @XFAIL test_invert_tan_cos
[skip_ci]
Added method to solve trignometric equations
added invert_complex method
updated formula for complex log
Handle I in solve_univariate_real_trigonometric_2
invert -> invert_real
solve_as_poly -> solve_as_poly_real
remove_dublication in solve_as_poly
added comments about invert
[skip_ci]
Improved the use of invert function
solve_univariate: misc updates
[skip_ci]
return S.Reals for solve_univariate_real(0, x)
naive import of _tsolve