Question

It looks like the only way to approach geomatry expression from javascript is Math object.

but I can’t express 3cos(30) although cos(30) can be expressed as Math.cos(30).

how can I express 3cos(30) in javascript?

Answer 1

Does 3cos(30) mean three times the cosine of 30? In that case, you can compute it like this:

var result = 3 * Math.cos(30);

Edit: Note that cos() expects it parameter to be in radians, not degrees.