Cos Expansion Using Functions

float cos(float p);
main()
{
    float x;
    printf("enter x");
    scanf("%f",&x);
    printf("cos(%f)=%f",x,cos(x));
}
float cos(float p)
{
    float x1,sum=0,term;
    int i;
    x1=p*3.14159266/180;
    term=1;
    for(i=1; i<=20; i++)
    {
        sum=sum+term;
        term=term*(-x1*x1)/(2*i*(2*i-1));
    }
    return sum;
}

     

           

Note: Need to be arranged in compiler after copied

   

 OutPut:

enter x90 cos(90.000000)=-0.000000