//COS
public static double Cos(double x, int n = 0, double precision = 1e-5)
{
var t = Power(-1, n) * Power(x, 2 * n) / MathSyst.Fack((uint)(2 * n));
if (MathSyst.Abs(t) < precision)
{
return(t);
}
return(t + Cos(x, n + 1, precision));
}
//SIN
public static double Sin(double x, int n = 1, double precision = 1e-5)
{
var t = MathSyst.Power(-1, n - 1) * MathSyst.Power(x, 2 * n - 1) / MathSyst.Fack((uint)(2 * n - 1));
if (MathSyst.Abs(t) < precision)
{
return(t);
}
return(t + Sin(x, n + 1, precision));
}
static public double Lognat(double x, int n = 1, double znat = 1e-5)
{
double t = MathSyst.Power(-1, n + 1) * MathSyst.Power(x - 1, n) / n;
long b = (long)t;
if (MathSyst.Abs(t) < 1e-3)
{
return(t);
}
return(b + Lognat(x, n + 1, znat));
}