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# cos (<valarray>)

Visual Studio 2008

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

```template<class Type>
valarray<Type> cos(
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 absolute value of the elements of the input valarray.

```// valarray_cos.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 ] =  ( pi ) * ( 0.25 * i - 1 );
valarray<double> va2 ( 9 );

cout << "The initial valarray is:\n";
for ( i = 0 ; i < 9 ; i++ )
cout << setw( 10 ) << va1 [ i ]
<< "  radians, which is  "
<< setw( 5 ) << ( 180/pi ) * va1 [ i ]
<< "  degrees" << endl;
cout << endl;

va2 = cos ( va1 );
cout << "The cosine of the initial valarray is:\n";
for ( i = 0 ; i < 9 ; i++ )
cout << va2 [ i ] << endl;
}
```
The initial valarray is: -3.14159 radians, which is -180 degrees -2.35619 radians, which is -135 degrees -1.5708 radians, which is -90 degrees -0.785398 radians, which is -45 degrees 0 radians, which is 0 degrees 0.785398 radians, which is 45 degrees 1.5708 radians, which is 90 degrees 2.35619 radians, which is 135 degrees 3.14159 radians, which is 180 degrees The cosine of the initial valarray is: -1 -0.707107 -1.03412e-013 0.707107 1 0.707107 -1.03412e-013 -0.707107 -1

Namespace: std

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