Trig Functions

(Redirected from ArcCos)

Analytica includes a full range of trigonometric functions, including Sin, Cos, Tan, their inverses, ASin, ACos, ATan, and ATan2, and hyperbolic functions, SinH, CosH, TanH, and their inverses, ASinH, ACosH, and ATanH.


Analytica's trigonometric functions operate using degrees as parameters (or value returned), not radians.

Trigonometric Functions

Functions Radians and Degrees

Radians(Degrees: atomic numeric)

Converts an angle measure in degrees to the equivalent in radians.

Degrees(Radians: numeric atomic)

Converts an angle expressed in radians to an equivalent in degrees.

Functions Cos, Sin and Tan

Basic trigonometric functions. Parameter is in degrees.

Sin(90) → 1
Cos(Degrees(Pi)) → -1

Functions ArcCos, ArcSin, ArcTan, ArcTan2

Inverse trig functions. Results are in Degrees.

ArcCos(X: Numeric atomic)
ArcSin(X: Numeric atomic)
ArcTan(X: Numeric atomic)
ArcTan2(Y, X: Numeric atomic)

The range of the results are as follows:

Function Range (in degrees)
ArcCos 0 to 180
ArcSin -90 to 90
ArcTan -90 to 90
ArcTan2 -180 to 180

Note: ArcTan2(0, 0) returns 0.

Functions CosH, SinH, TanH

Hyperbolic trig functions. The parameter is in degrees.

An xy-graph of Sin(x) vs. Cos(x) plots a circle. Analoguously, an xy-graph of SinH(x) vs. CosH(x) plots a hyperbola (on the right side of the y-axis):

plot for -90≤x≤90

Although the parameter is specified in degrees, it does not denote an angle to the point on the hyperbola. «x» is referred to as the hyperbolic angle and is defined to be the area of the hyperbolic sector times [math]\displaystyle{ 360 / \pi }[/math]. Conversely, the area of the hyperbolic sector is [math]\displaystyle{ x \pi / 360 }[/math].

[math]\displaystyle{ CosH(x) = {{e^{Radians(x)} + e^{-Radians(x)}}\over 2} }[/math]
[math]\displaystyle{ SinH(x) = {{e^{Radians(x)} - e^{-Radians(x)}}\over 2} }[/math]
[math]\displaystyle{ TanH(x) = {{e^{Radians(x)} - e^{-Radians(x)}}\over {e^{Radians(x)} + e^{-Radians(x)}}} }[/math]
[math]\displaystyle{ e^{Radians(x)} = CosH(x) + SinH(x) }[/math]
[math]\displaystyle{ e^{Radians(x)} = CosH(x) - SinH(x) }[/math]

The hyperbolic functions are also defined for complex numbers «x».

Functions ArcCosH, ArcSinH, ArcTanH

Inverse hyperbolic trigonometric functions. The returned value is in degrees.

ArcCosH(x) returns the value such that CosH(ArcCosH(x))=x and ArcCosH(CosH(x))=x.

ArcSinH(x) returns the value such that SinH(ArcSinH(x))=x and ArcSinH(SinH(x))=x.

ArcTanH(x) returns the value such that TanH(ArcTanH(x))=x and ArcTanH(TanH(x))=x.

These are equivalent to the following expressions.

ArcCosH(x) = Degrees( Ln( x + Sqrt( x^2-1 ) ) )
ArcSinH(x) = Degrees( Ln( x + Sqrt( x^2+1 ) ) )
ArcTanH(x) = Degrees( 0.5 * Ln( (1+x) / (1-x) ) )

See Also


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