Coding Period Week 9

Organization : SymPy
Solvers: Completing Solveset

17 July 2016 - 23 July 2016

by Shekhar Prasad Rajak — Posted on July 20, 2016

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Some points regarding trigonometric and inverse trigonometric functions in solveset :

  • There are many issues in solveset solve_trig.More inverse trigonometric formula and trigonometric identities should be defined/added or improved. Also simplify, trigsimp and in solveset _invert methods should be improved accordingly.

  • Some links, that is helpful to improve these functions.

  • trigsimp must be more powerful so that solve_trig get simplified eq. (which solves trig equation by converting them into its exp form).

  • solve_trig solves the trig eq. using its exp form. There may be cases when that exp form is complicated and solveset fail to handle that form. There should be technique to convert that complicated form to simpler form(if possible) and then call the solveset_complex. That may help to improve the solve_trig method.

  • We can use _osbornei, hyper_as_trig methods defined in simplify/fu.py to convert hyperbolic function to trigonometric function, then we can use trigsimp (we can’t use trigsimp for hyperbolic functions).

  • First need to improve basic concepts and add more identities. I opened a new PR to improve rewrite for trigonometric functions , PR is #11424.


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