`fpsinh``x`procedure`fpcosh``x`procedure`fptanh``x`procedure- x
- flonum

Return the hyperbolic sine, cosine, and tangent of

`x`, respectively.Maximum observed error is 2 ulps (see

`fpulp`), making these functions (currently) much more accurate than their`(math base)`counterparts (**Note:**currently missing). They also return sensible values on the largest possible domain.