nerdamer.asech(x: ExpressionInput): Expression
Computes the inverse hyperbolic secant of an expression: asech(x) = acosh(1/x).
For real evaluation, uses the identity asech(x) = ln((1 + sqrt(1/x² − 1))/x).
throwscore!UndefinedError If x is ±∞.
Parameters
| Name | Type | Description |
|---|
x | ExpressionInput | The input expression (domain (0, 1] for real results). |
Returns
Expression — The inverse hyperbolic secant of x.
Examples
asech(1).text() // "0"
// Symbolic
asech('x').text() // "asech(x)"
