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cos(x as float) in Math Library Functions of Programming in CPP
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Usage 
The cosine function is used to return cosine value of the angle given.
Syntax 
cos (angle)
Syntax
#include <stdio.h>   
#include <math.h>   

int main ()
{

  printf ("The cosine of degrees =", cos(30) );
  return 0;
}
Output 
The cosine of degrees = 0.86602540378
 
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