Noun
hyperbolic sine (plural hyperbolic sines)
(mathematics) A hyperbolic function that is the analogue of the sine function for hyperbolic spaces, taking in a hyperbolic angle as an argument and returning the y-coordinate for the corresponding point on the unit hyperbola. It is written in symbol sinh and can be represented as:
sinh
(
x
)
=
1
2
(
e
x
−
e
−
x
)
{\displaystyle \sinh(x)={\tfrac {1}{2}}(e^{x}-e^{-x})}