Evaluate cosx=1-x^2/2!+x^4/4!............+x^n/n! .where x is in radian.[for loop]

/*Evaluate cosx=1-x^2/2!+x^4/4!............+x^n/n! .where x is in radian.[for loop]*/

#include<stdio.h>
#include<conio.h>

void main()
{
    int i, n;
    float x, sum=1, a=1;
   
    printf(" Enter the value of x : ");
    scanf("%f",&x);
   
    printf(" Enter the value of n : ");
    scanf("%d",&n);
   
    x=x*3.1415/180;
   
    for(i=1;i<=n;i++)
    {
        a=a*(-1)*x*x/(2*i*(2*i-1));           // decorate same as series excluding 1 at beginning
        sum=sum+a;                                    // now add 1 to whole series (sum=1)
    }
   
    printf(" The value of Cosx is : %.4f",  sum);
    getch();
}


OUTPUT:
 Enter the value of x :30
 Enter the value of n :5
 The value of Cosx is :0.8660

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Milan Tomic

Hi. I’m Designer of Blog Magic. I’m CEO/Founder of ThemeXpose. I’m Creative Art Director, Web Designer, UI/UX Designer, Interaction Designer, Industrial Designer, Web Developer, Business Enthusiast, StartUp Enthusiast, Speaker, Writer and Photographer. Inspired to make things looks better.

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