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Showing content from https://cplusplus.com/reference/valarray/asin/ below:

function template

std::asin

template<class T> valarray<T> asin (const valarray<T>& x);

Compute arc sine of valarray elements

Returns a valarray object containing the principal values of the arc sine of all the elements of x, expressed in radians, in the same order.

The function calls acos (unqualified) once for each element.

This function overloads cmath's asin.

Parameters

x: valarray containing elements of a type for which the unary function asin is defined.

Return value A valarray object with the arc sine values of the elements of x.

Example

// asin valarray example
#include <iostream>     // std::cout
#include <cstddef>      // std::size_t
#include <cmath>        // std::asin(double)
#include <valarray>     // std::valarray, std::asin(valarray)

int main ()
{
  double val[] = {0.0, 0.25, 0.5, 0.75, 1.0};
  std::valarray<double> foo (val,5);

  std::valarray<double> bar = asin (foo);

  std::cout << "foo:";
  for (std::size_t i=0; i<foo.size(); ++i)
    std::cout << ' ' << foo[i];
  std::cout << '\n';

  std::cout << "bar:";
  for (std::size_t i=0; i<bar.size(); ++i)
    std::cout << ' ' << bar[i];
  std::cout << '\n';

  return 0;
}

Output:

foo: 0 0.25 0.5 0.75 1
bar: 0 0.25268 0.523599 0.848062 1.5708