Add support for more math functions in calc

[romainmenke]

What would you want to propose?

WebKit added support for calc() math functions including sin, cos, tan, e, pi, exp, log, atan, acos, asin, and atan2.

Suggested solution

A new plugin :)

Additional context

https://webkit.org/blog/12445/new-webkit-features-in-safari-15-4/

https://www.w3.org/TR/css-values-4/#trig-funcs

Validations

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

Would you like to open a PR for this feature?

• I'm willing to open a PR

[jonathantneal]

Were fallbacks like these considered?

https://github.com/csstools/postcss-trig

[Antonio-Laguna]

@jonathantneal yes and no.

No, because I didn't find that package till a month later since the package was released.
Yes because I knew some of those equations and I decided not to go with that.

Spec is quite strict around types, nested calc being possible, and multiple scenarios which I don't think the fallbacks would cut it. I think there's value there as a last resort when you're using var but it's not easily testable (other than, produces expected output) or deterministic given var could be anything.