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fpsinh xprocedure
fpcosh xprocedure
fptanh xprocedure
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.