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TANH(3P) POSIX Programmer's Manual TANH(3P)This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.PROLOGtanh, tanhf, tanhl - hyperbolic tangent functionsNAME#include <math.h> double tanh(double x); float tanhf(float x); long double tanhl(long double x);SYNOPSISThese functions shall compute the hyperbolic tangent of their argument x. An application wishing to check for error situations should set errno to zero and call feclearex- cept(FE_ALL_EXCEPT) before calling these functions. On return, if errno is non-zero or fetestex- cept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred.DESCRIPTIONUpon successful completion, these functions shall return the hyperbolic tangent of x. If x is NaN, a NaN shall be returned. If x is +-0, x shall be returned. If x is +-Inf, +-1 shall be returned. If x is subnormal, a range error may occur and x should be returned.RETURN VALUEThese functions may fail if: Range Error The value of x is subnormal. If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the underflow floating-point exception shall be raised. The following sections are informative.ERRORSNone.EXAMPLESOn error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are indepen- dent of each other, but at least one of them must be non-zero.APPLICATION USAGENone.RATIONALENone.FUTURE DIRECTIONSatanh(), feclearexcept(), fetestexcept(), isnan(), tan(), the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for Mathematical Functions, <math.h>SEE ALSOPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information TechnologyCOPYRIGHTPortable Operating System Interface (POSIX), The Open Group Base Speci- fications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .--/The Open Group 2003 TANH(3P)IEEE

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