ArcTan: 
VB自帶：Atn 

ArcSin: 
Function ArcSin(X As Doule) As Double 
Dim Temp As Double 
If X = 0 Then 
Temp=0 
Else 
Temp = Atn(X/Sqr(1-X*X)) 
End If 
ArcSin=Temp 
End Function 

ArcCos: 
Function ArcCos(X As Doule) As Double 
Dim Temp As Double 
If X = 0 Then 
Temp=pi/2 
Else 
Temp = Atn(Sqr(1-X*X)/X) 
End If 
ArcCos=Temp 
End Function 

'Secant 
Public Function Sec(ByVal Number As Double) As Double 
Sec = 1 / Cos(Number) 
End Function 

'Cosecant 
Public Function Csc(ByVal Number As Double) As Double 
Csc = 1 / Sin(Number) 
End Function 

'Cotangent 
Public Function Ctn(ByVal Number As Double) As Double 
Ctn = 1 / Tan(Number) 
End Function 

'Inverse Sine 
Public Function ASin(ByVal Number As Double) As Double 
ASin = Atn(Number / Sqr(-Number * Number + 1)) 
End Function 

'Inverse Cosine 
Public Function ACos(ByVal Number As Double) As Double 
ACos = Atn(-Number / Sqr(-Number * Number + 1)) + 2 * Atn(1) 
End Function 

'Inverse Secant 
Public Function ASec(ByVal Number As Double) As Double 
ASec = Atn(Number / Sqr(Number * Number - 1)) + Sgn((Number) - 1) * (2 * 
Atn(1)) 
End Function 

'Inverse Cosecant 
Public Function ACsc(ByVal Number As Double) As Double 
ACsc = Atn(Number / Sqr(Number * Number - 1)) + (Sgn(Number) - 1) * (2 * 
Atn(1)) 
End Function 

'Inverse Cotangent 
Public Function ACtn(ByVal Number As Double) As Double 
ACtn = Atn(Number) + 2 * Atn(1) 
End Function 

'Hyperbolic Sine 
Public Function SinH(ByVal Number As Double) As Double 
SinH = (Exp(Number) - Exp(-Number)) / 2 
End Function 

'Hyperbolic Cosine 
Public Function CosH(ByVal Number As Double) As Double 
CosH = (Exp(Number) + Exp(-Number)) / 2 
End Function 

'Hyperbolic Tangent 
Public Function TanH(ByVal Number As Double) As Double 
TanH = (Exp(Number) - Exp(-Number)) / (Exp(Number) + Exp(-Number)) 
End Function 

'Hyperbolic Secant 
Public Function SecH(ByVal Number As Double) As Double 
SecH = 2 / (Exp(Number) + Exp(-Number)) 
End Function 

'Hyperbolic Cosecant 
Public Function CscH(ByVal Number As Double) As Double 
CscH = 2 / (Exp(Number) - Exp(-Number)) 
End Function 

'Hyperbolic Cotangent 
Public Function CtnH(ByVal Number As Double) As Double 
CtnH = (Exp(Number) + Exp(-Number)) / (Exp(Number) - Exp(-Number)) 
End Function 

'Inverse Hyperbolic Sine 
Public Function ASinH(ByVal Number As Double) As Double 
ASinH = Log(Number + Sqr(Number * Number + 1)) 
End Function 

'Inverse Hyperbolic Cosine 
Public Function ACosH(ByVal Number As Double) As Double 
ACosH = Log(Number + Sqr(Number * Number - 1)) 
End Function 

'Inverse Hyperbolic Tangent 
Public Function ATanH(ByVal Number As Double) As Double 
ATanH = Log((1 + Number) / (1 - Number)) / 2 
End Function 

'Inverse Hyperbolic Secant 
Public Function ASecH(ByVal Number As Double) As Double 
ASecH = Log((Sqr(-Number * Number + 1) + 1) / Number) 
End Function 

'Inverse Hyperbolic Cosecant 
Public Function ACscH(ByVal Number As Double) As Double 
ACscH = Log((Sgn(Number) * Sqr(Number * Number + 1) + 1) / Number) 
End Function 

'Inverse Hyperbolic Cotangent 
Public Function ACtnH(ByVal Number As Double) As Double 
ACtnH = Log((Number + 1) / (Number - 1)) / 2 
End Function 

'Logarithm to base N 
Public Function LogN(ByVal Base As Double, ByVal Number As Double) 
LogN = Log(Number) / Log(Base) 
End Function 

'Convert degrees to radians 
Public Function DegToRad(ByVal Number As Double) As Double 
DegToRad = Number * 1.74532925199433E-02 'pi/180 
End Function 

'Convert radians to degrees 
Public Function RadToDeg(ByVal Number As Double) As Double 
RadToDeg = Number * 57.2957795130824 ' 180/pi 
End Function