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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../cpp/numeric/math/tanh.html below:

std::tanh, std::tanhf, std::tanhl - cppreference.com

(1) float       tanh ( float num );

double      tanh ( double num );

long double tanh ( long double num ); (until C++23)

/*floating-point-type*/
            tanh ( /*floating-point-type*/ num );

(since C++23)
(constexpr since C++26)

float       tanhf( float num );

(2) (since C++11)
(constexpr since C++26)

long double tanhl( long double num );

(3) (since C++11)
(constexpr since C++26) template< /*math-floating-point*/ V >

constexpr /*deduced-simd-t*/<V>

            tanh ( const V& v_num ); (S) (since C++26)

template< class Integer >
double      tanh ( Integer num );

(A) (constexpr since C++26)

1-3) Computes the hyperbolic tangent of num. The library provides overloads of std::tanh for all cv-unqualified floating-point types as the type of the parameter.(since C++23)

A) Additional overloads are provided for all integer types, which are treated as double.

(since C++11) [edit] Parameters num - floating-point or integer value [edit] Return value

If no errors occur, the hyperbolic tangent of

num

(

tanh(num)

, or

) is returned.

If a range error occurs due to underflow, the correct result (after rounding) is returned.

[edit] Error handling

Errors are reported as specified in math_errhandling.

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

[edit] Notes

POSIX specifies that in case of underflow, num is returned unmodified, and if that is not supported, and implementation-defined value no greater than DBL_MIN, FLT_MIN, and LDBL_MIN is returned.

The additional overloads are not required to be provided exactly as (A). They only need to be sufficient to ensure that for their argument num of integer type, std::tanh(num) has the same effect as std::tanh(static_cast<double>(num)).

[edit] Example 
#include <cmath>
#include <iostream>
#include <random>
 
double get_random_between(double min, double max)
{
    std::random_device rd;
    std::mt19937 gen(rd());
    return std::uniform_real_distribution<>(min, max)(gen);
}
 
int main()
{
    const double x = get_random_between(-1.0, 1.0);
 
    std::cout << std::showpos
              << "tanh(+1) = " << std::tanh(+1) << '\n'
              << "tanh(-1) = " << std::tanh(-1) << '\n'
              << "tanh(x)*sinh(2*x)-cosh(2*x) = "
              << std::tanh(x) * std::sinh(2 * x) - std::cosh(2 * x) << '\n'
              // special values:
              << "tanh(+0) = " << std::tanh(+0.0) << '\n'
              << "tanh(-0) = " << std::tanh(-0.0) << '\n';
}

Output:

tanh(+1) = +0.761594
tanh(-1) = -0.761594
tanh(x)*sinh(2*x)-cosh(2*x) = -1
tanh(+0) = +0
tanh(-0) = -0
[edit] See also

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