[RFC]: Add C implementation for @stdlib/math/base/special/aversin

[Snehil-Shah]

Description

This RFC proposes adding native C implementation for @stdlib/math/base/special/aversin.

double stdlib_base_avercos( const double x );

Related Issues

Related issues #649

Questions

No.

Other

No.

Checklist

• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.

[Snehil-Shah]

Working on it!