Where to find it:

NodeGraph / Right Mouse Click / Add Nodes / Math / Extension Pack / A /

return the arc hyperbolic sine of the parameter

asinh returns the arc hyperbolic sine of x; the inverse of gl_sinh.

https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/asinh.xhtml

•X

Specify the value whose arc hyperbolic sine to return.

•Output RGB

Separate computation for Input Channels Red, Green, Blue with an Alpha Channel of 1.0

•R

Computation for Input Red channel only, saved into R, G and B channel with an Alpha of 1.0

•G

Computation for Input Green channel only, saved into R, G and B channel with an Alpha of 1.0

•B

Computation for Input Blue channel only, saved into R, G and B channel with an Alpha of 1.0

•A

Computation for Input Alpha channel only, saved into R, G and B channel with an Alpha of 1.0