#include<stdio.h>
#include<math.h>
int main(void)
{
    double x = 0.5;
    double F(double x);
    double G(double x);

    printf("x=%lf F=%lf G=%lf delta=%lf\n", x, F(x), G(x), F(x) - G(x));
    return 0;
}

double F(double x)
{
    int k, N = 3;
    double V, U = x*x;
    double S = x*x;
    for (k =1; k < N; k++)
    {
        V = -(4 * x*x) / ((2 * k + 1)*(2 * k + 2));
        U = U*V; //2 слагаемое
        S = U + S;// cумма 1 и 2
        printf("U=%.6lf S=%.6lf\n", U, S); //выводим их
    }
return(U,S);

}



double G(double x)
{
    return sin(x)*sin(x);

}