#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

double integral(int n, double x)
{
    if (n == 1)
        return -cos(x);
    if (n == 2)
        return (x/2)-((1/4)*sin(2*x));
    if (n > 2)
        return -(pow(sin(x), n-1)*cos(x))/n + ((n-1)/n)*integral(n-2, x);
}

int main()
{
    double x = 0.0; int n = 0;
    printf("%s", "Enter x: \n");
    scanf("%lf", &x);

    printf("%s", "Enter n: \n");
    scanf("%d", &n);

    double result = integral(n, x);
    printf("%s %f","Result: ",result);
    getchar();
    getchar();
    return 0;
}