calc() helpers or math ready props

[argyleink]

--pi: 3.14159;
--sqrt2: 1.414;

[argyleink]

w3c/csswg-drafts#4688

E: 2.718281828459045
LN10: 2.302585092994046
LN2: 0.6931471805599453
LOG10E: 0.4342944819032518
LOG2E: 1.4426950408889634
PI: 3.141592653589793
SQRT1_2: 0.7071067811865476
SQRT2: 1.4142135623730951

[Afif13]

I think some sin()/cos()/tan() values would help. I use them a lot especially for some specific angles (45deg, 30deg, 60deg).
Something like

--sin45:
--cos45:
..

Until we get support for the Trigo functions.