Q:

How do I write equations with sin in .NET Math class?

I know how to solve this using a calculator, but how do I solve it using the Math class in .NET?
(15/sin(v))=(10/sin(37))

A:

Math doesn't offer a solver; it simply provides a few tools for common math operations. You would have to solve it manually, or fine a solver lib.
But anecdotally:
var v = 180 * Math.Asin(15 * Math.Sin(37 * Math.PI / 180) / 10) / Math.PI;
  // ~= 64.518 degrees

assuming you want your units in degrees.

