### Description This RFC proposes adding native C implementation for [@stdlib/math/base/special/asec](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/asec). `double stdlib_base_asec( const double x );` ### Related Issues Related issues # [649](https://github.com/stdlib-js/stdlib/issues/649) ### Questions No. ### Other No. ### Checklist - [X] I have read and understood the [Code of Conduct](https://github.com/stdlib-js/stdlib/blob/develop/CODE_OF_CONDUCT.md). - [X] Searched for existing issues and pull requests. - [X] The issue name begins with `RFC:`.