/// <summary>
/// Calculates the cosine of a given angle in RADIANS.
/// </summary>
/// <param name="a">The angle to calculate the cosine of</param>
/// <returns>The cosine of the given angle</returns>
public static double Cosine(double a)
{
a %= Math.PI * 2;
double result = 1;
bool add = false;
double term = 0;
double previousTerm;
int i = 2;
do
{
previousTerm = term;
term = IVSMath.Power(a, i) / IVSMath.Factorial(i);
if (add)
{
result += term;
}
else
{
result -= term;
}
add = !add;
i += 2;
} while (Math.Abs(term - previousTerm) > IVSMath.precision);
return(result);
}
/// <summary>
/// Calculates the tangent of a given angle in RADIANS.
/// </summary>
/// <param name="a">The angle to compute the tangent of</param>
/// <exception cref="ArithmeticException">The specified angle is invalid.</exception>
/// <exception cref="OverflowException">The result is too large to be stored by a double</exception>
/// <returns>The tangent of the given angle</returns>
public static double Tangent(double a)
{
if (IVSMath.IsValidTanAngle(a))
{
throw new ArithmeticException();
}
double result = IVSMath.Sine(a) / IVSMath.Cosine(a);
if (Double.IsInfinity(result))
{
throw new OverflowException();
}
return(result);
}