**Public Function ASinH( _
ByVal vX As Variant _
) As Variant**

**"Inverse Hyperbolic Sine" **

Angle whose hyperbolic sine is X.

Inverse of the SinH function.

**Examples:** ASinH(-10) = -2.99822295029798
ASinH(-2) = -1.44363547517881
ASinH(-1) = -0.881373587019543
ASinH(0) = 0
ASinH(1) = 0.881373587019543
ASinH(2) = 1.44363547517881
ASinH(10) = 2.99822295029797
ASinH("2.3|-4.5") = "2.3075846192625|-1.09022846498264"

**See also:** ASin Function
SinH Function
ACosH Function
ATanH Function
HArcsin Function

**vX:** Function returns the principal value of the angle whose hyperbolic sine (expressed in radians) is vX. Function returns Null if vX is Null or cannot be fixed up to a real or complex number (as defined by the ComplexStringToReals function). Complex numbers are represented within strings as "R|I" where R is the real part and I is the imaginary part.

**Note:** Microsoft named this function HArcsin within their Derived Math Function help topic. **Definition:**

Logarithm(Sqrt(X^2 + 1) + X)

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