cpp/numeric/math/sinh

@1-3@ Computes the hyperbolic sine of.

Return value
If no errors occur, the hyperbolic sine of ($sinh(num)$, or $$) is returned.

If a range error due to overflow occurs, huge_val,, or is returned.

If a range error occurs due to underflow, the correct result (after rounding) is returned.

Error handling
Errors are reported as specified in math_errhandling.

If the implementation supports IEEE floating-point arithmetic (IEC 60559),
 * if the argument is ±0 or ±∞, it is returned unmodified
 * if the argument is NaN, NaN is returned