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asin

Visual Studio 2008

Operates on the elements of an input valarray, returning a valarray whose elements are equal to the arcsine of the elements of the input valarray.

```template<class Type>
valarray<Type> asin(
const valarray<Type>& _Left
);
```
_Left

The input valarray whose elements are to be operated on by the member function.

A valarray whose elements are equal to the arcsine of the elements of the input valarray.

The units of the returned elements are in radians.

The return value is a principal value between +pi/2 and –pi/2 that is consistent with the sine value input.

```// valarray_asin.cpp
// compile with: /EHsc
#include <valarray>
#include <iostream>
#include <iomanip>

int main( )
{
using namespace std;
double pi = 3.14159265359;
int i;

valarray<double> va1 ( 9 );
for ( i = 0 ; i < 9 ; i++ )
va1 [ i ] =  0.25 * i - 1;
valarray<double> va2 ( 9 );

cout << "The initial valarray is:";
for (i = 0 ; i < 9 ; i++ )
cout << " " << va1 [ i ];
cout << endl;

va2 = asin ( va1 );
cout << "The arcsine of the initial valarray is:\n";
for (i = 0 ; i < 9 ; i++ )
cout << setw(10) << va2 [ i ]
<< "  radians, which is  "
<< setw(11) << (180/pi) * va2 [ i ]
<< "  degrees" << endl;
}
```
The initial valarray is: -1 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 1 The arcsine of the initial valarray is: -1.5708 radians, which is -90 degrees -0.848062 radians, which is -48.5904 degrees -0.523599 radians, which is -30 degrees -0.25268 radians, which is -14.4775 degrees 0 radians, which is 0 degrees 0.25268 radians, which is 14.4775 degrees 0.523599 radians, which is 30 degrees 0.848062 radians, which is 48.5904 degrees 1.5708 radians, which is 90 degrees

Namespace: std