static public double Sin(double x, double accuracy)
{
bool sign = (x >= 0) ? true : false;
x = Math.Abs(x);
while (x >= 2 * Math.PI)
{
x -= 2 * Math.PI;
}
x = sign ? x : -x;
double result = x;
double element = x;
double element1;
int i = 0;
do
{
element1 = (-1) * element * Math.Pow(x, 2) / ((2 * i + 2) * (2 * i + 3));
result += element1;
element = element1;
i++;
} while (Math.Abs(element) > accuracy);
return(result);
}
static public double EPowXClasic(double x, double accuracy)
{
if (x == 0)
{
return(1);
}
bool minus = false;
if (x < 0)
{
minus = true;
x *= -1;
}
double result = 1 + x;
double element;
int i = 2;
do
{
element = Math.Pow(x, i) / Math.Factor(i);
result += element;
i++;
} while (Math.Abs(element) > accuracy);
if (minus)
{
result = 1 / result;
}
return(result);
}
static public double EPowXReq(double x, double accuracy)
{
if (x == 0)
{
return(1);
}
bool minus = false;
if (x < 0)
{
minus = true;
x *= -1;
}
double result = 1 + x;
double element = x;
double element1;
int i = 1;
do
{
element1 = element * x / (i + 1);
result += element1;
element = element1;
i++;
} while (Math.Abs(element) > accuracy);
if (minus)
{
result = 1 / result;
}
return(result);
}
static public double Ln(double arg, double accuracy)
{
if (arg == 0)
{
return(double.NegativeInfinity);
}
if (arg < 0)
{
return(double.NaN);
}
if (arg > 2)
{
int count = 0;
while (arg > 2)
{
arg /= 2;
count++;
}
return(count * Ln(2, accuracy) + Ln(arg, accuracy));
}
double x = arg - 1;
double element = x;
double element1;
double result = x;
int i = 1;
accuracy /= 10;
while (Math.Abs(element) > accuracy)
{
element1 = -element * (x * i / (i + 1));
result += element1;
element = element1;
i++;
if (double.IsNaN(result))
{
break;
}
}
return(result);
}
