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Chapter 26
`math.ss`: Math

To load: `(require (lib "math.ss"))`

`(conjugate``` `z``)` PROCEDURE

Returns the complex conjugate of `z`.

`(cosh``` `z``)` PROCEDURE

Returns the hyperbolic cosine of `z`.

`e` NUMBER

Approximation of Euler's number, equivalent to `(exp `1.0`)`.

`pi` NUMBER

Approximation of pi, equivalent to `(`atan` 0.0 -1.0)`.

`(sinh``` `z``)` PROCEDURE

Returns the hyperbolic sine of `z`.

`(sgn``` `n``)` PROCEDURE

Returns `1` if `n` is positive, `-1` if `n` is negative, and `0` otherwise. If `n` is exact, the result is exact, otherwise the result is inexact.

`(sqr``` `z``)` PROCEDURE

Returns `(* z z))`.