public static decimal Tan(decimal angle)
{
decimal denominator = DecimalMath.Cos(angle);
if (denominator == 0.0M)
{
throw new ArgumentOutOfRangeException(nameof(angle), ErrorMessages.NonZero);
}
else
{
//tangent is just sine over cosine
decimal numerator = DecimalMath.Sin(angle);
return(numerator / denominator);
}
}
public static decimal Cos(decimal angle)
{
//cosine is just offset sine
return(DecimalMath.Sin((DecimalMath.PI / 2.0M) - angle));
}