Question

How to use cos() function to get the cosine of an angle of N radians in C

Answer 1

#include <stdio.h>     
#include <math.h>
 
int main(int argc, char **argv)
{
	printf("cos(-1) = %.6f\n", cos(-1));
    printf("cos(1) = %.6f\n", cos(1));
    printf("cos(0) = %.6f\n", cos(0));
	printf("cos(-0) = %.6f\n", cos(-0));
    printf("cos(0.9) = %.6f\n", cos(0.9));
    printf("cos(3.141593 / 3) = %.6f\n", cos(3.141593 / 3));
    printf("cos(3.141593 / 2) = %.6f\n", cos(3.141593 / 2));

    return 0;
}

/*
run:
  
cos(-1) = 0.540302
cos(1) = 0.540302
cos(0) = 1.000000
cos(-0) = 1.000000
cos(0.9) = 0.621610
cos(3.141593 / 3) = 0.500000
cos(3.141593 / 2) = -0.000000

*/

 

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