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(freebsd section 3)
man page for tanh

TANH(3) 						   BSD Library Functions Manual 						   TANH(3)

tanh, tanhf, tanhl -- hyperbolic tangent functions LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double tanh(double x); float tanhf(float x); long double tanhl(long double x); DESCRIPTION
The tanh(), tanhf(), and tanhl() functions compute the hyperbolic tangent of x. For a discussion of error due to roundoff, see math(3). RETURN VALUES
The tanh(), tanhf(), and the tanhl() functions return the hyperbolic tangent value. SEE ALSO
acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), ctanh(3), math(3), sin(3), sinh(3), tan(3) STANDARDS
The tanh() function conforms to ISO/IEC 9899:1990 (``ISO C90''). BSD
August 17, 2013 BSD

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