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TANH(3) NetBSD Library Functions Manual TANH(3)
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tanh, tanhf -- hyperbolic tangent function
Math Library (libm, -lm)
The tanh() and tanhf() functions compute the hyperbolic tangent of x.
For a discussion of error due to roundoff, see math(3).
Upon successful completion, these functions return the hyperbolic tangent
value. The following may also occur:
1. If x is ± 0, x is returned.
2. If x is NaN, a NaN is returned.
3. If x is positive infinity, a value 1 is returned; if x is neg-
ative infinity, -1 is returned.
4. If x is subnormal, a range error can occur and x is returned.
acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3),
The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').
NetBSD 10.99 September 18, 2011 NetBSD 10.99