# Documentation/How Tos/Calc: ASINH function

From Apache OpenOffice Wiki

## ASINH

Returns the inverse hyperbolic sine of a number.

### Syntax:

**ASINH(number)**

- returns the inverse hyperbolic sine of
, in other words the number whose hyperbolic sine is**number**.**number**

### Example:

**ASINH(-90)**

- returns approximately
.**-5.1929877**

**ASINH(SINH(4))**

- returns
.**4**