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TANH(3) Library Functions Manual TANH(3) NAME tanh, tanhf - hyperbolic tangent function LIBRARY Math Library (libm, -lm) SYNOPSIS #include <math.h> double tanh(double x); float tanhf(float x); DESCRIPTION The tanh() and tanhf() functions compute the hyperbolic tangent of x. For a discussion of error due to roundoff, see math(3). RETURN VALUES 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 negative infinity, -1 is returned. 4. If x is subnormal, a range error can occur and x is returned. SEE ALSO acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3) STANDARDS The described functions conform to ISO/IEC 9899:1999 ("ISO C99"). NetBSD 8.99.34 September 18, 2011 NetBSD 8.99.34