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Thorbjørn Lindeijer 2e6cb23b56 feat: add Num.tan method to core library and documentation
Add the missing `tan` method to the Num class, implementing the tangent
trigonometric function. This fills the gap between the existing `sin` and
`cos` methods, providing a complete set of basic trigonometric operations.

- Register `num_tan` primitive in the VM core initialization
- Implement `DEF_PRIMITIVE(num_tan)` using C's `tan()` math function
- Add documentation entry for `tan` in the core library reference
2015-03-14 13:40:23 +00:00
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