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    The following form allows you to view linux man pages.

    Command:

    expm1

    
    
    

    SYNOPSIS

           #include <math.h>
    
           double expm1(double x);
           float expm1f(float x);
           long double expm1l(long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           expm1():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
               _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
           expm1f(), expm1l():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           expm1(x) returns a value equivalent to
    
               exp(x) - 1
    
           It is computed in a way that is accurate even if the value of x is near
           zero--a  case where exp(x) - 1 would be inaccurate due to subtraction of
           two numbers that are nearly equal.
    
    
    

    RETURN VALUE

           On success, these functions return exp(x) - 1.
    
           If x is a NaN, a NaN is returned.
    
           If x is +0 (-0), +0 (-0) is returned.
    
           If x is positive infinity, positive infinity is returned.
    
           If x is negative infinity, -1 is returned.
    
           If the result overflows, a range error occurs, and the functions return
           -HUGE_VAL, -HUGE_VALF, or -HUGE_VALL, respectively.
    
    
    

    ERRORS

           See  math_error(7) for information on how to determine whether an error
           has occurred when calling these functions.
    
           The following errors can occur:
    
           Range error, overflow
                  errno is set to ERANGE (but see BUGS).   An  overflow  floating-
    
           ing-point exception in addition to the expected overflow exception, and
           returns a NaN instead of positive infinity.
    
           Before version 2.11, the glibc implementation  did  not  set  errno  to
           ERANGE when a range error occurred.
    
    
    

    SEE ALSO

           exp(3), log(3), log1p(3)
    
                                      2013-10-14                          EXPM1(3)
    
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