C Reference function cos()

Usage of cos():

double cos(double x);

Parameters:

The value of x has no range.

Return value:

The returned value is in the range of -1 to +1 (inclusive).

Source code example of cos():


	#include<stdio.h>
	#include<math.h>

	#define PI 3.14159265

	main()
	{
		double input, output;
		input = 60.0;
		output = cos (input*PI/180);
		printf ("Cosine of %lf degrees is %lf.\n", input, output );
		return 0;
	}

Output of the cos example program above:


	Cosine of 60.000000 degrees is 0.500000

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