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TANH(3) Library Functions Manual TANH(3)NAMEtanh,tanhf- hyperbolic tangent functionLIBRARYMath Library (libm, -lm)SYNOPSIS#include<math.h>doubletanh(double x); floattanhf(float x);DESCRIPTIONThetanh() andtanhf() functions compute the hyperbolic tangent of x. For a discussion of error due to roundoff, see math(3).RETURNVALUESUpon 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 ALSOacos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3)STANDARDSThe described functions conform to ISO/IEC 9899:1999 ("ISO C99"). NetBSD 10.99 September 18, 2011 NetBSD 10.99