| Oracle9i SQL Reference Release 2 (9.2) Part Number A96540-02  | 
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tanh::=
 TANH returns the hyperbolic tangent of n.
The following example returns the hyperbolic tangent of .5:
SELECT TANH(.5) "Hyperbolic tangent of .5" FROM DUAL; Hyperbolic tangent of .5 ------------------------ .462117157