Easy calculation

[equation_sof]

pls help me.my code is giving right ans but it is giving WA...pls help me...

#include<iostream>
#include<math.h>
using namespace std;
int main(){
    int t;
    scanf("%d",&t);
    while(t--){
               int a,b,c;
               scanf("%d%d%d",&a,&b,&c);
               double x[6];
               x[0]=double(c/a);
               for(int i=1;i<6;i++){
                      double d=(a*x[i-1])+(b*sin(x[i-1]))-c;
                      double e=a+(b*cos(x[i-1]));         
                  x[i]=x[i-1]-double(d/e); 
                  } 
                  printf("%0.6f\n",x[5]);
                  }
                  return 0;
                  }