/// <summary>
/// Calculates Cos(x)
/// </summary>
/// <param name="n1">The angle (in radians) to find the cosine of</param>
/// <remarks>This is a reasonably fast function for smaller precisions, but
/// doesn't scale well for higher precision arguments</remarks>
public static BigFloat Cos(BigFloat n1)
{
BigFloat res = new BigFloat(n1);
n1.Cos();
return n1;
}