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```#include <stdio.h>

// Function to calculate the derivative using Newton divided difference
double newtonDividedDifference(double x[], double y[], int n, double target) {
double result = 0.0;

// Calculate divided differences
double dividedDiffs[n][n];
for (int i = 0; i < n; i++) {
dividedDiffs[i][0] = y[i];
}
for (int j = 1; j < n; j++) {
for (int i = 0; i < n - j; i++) {
dividedDiffs[i][j] = (dividedDiffs[i + 1][j - 1] - dividedDiffs[i][j - 1]) / (x[i + j] - x[i]);
}
}

// Calculate the derivative value
double xProduct = 1.0;
for (int i = 0; i < n; i++) {
result += dividedDiffs[0][i] * xProduct;
xProduct *= (target - x[i]);
}

return result;
}

int main() {
int n; // Number of data points
printf("Enter the number of data points: ");
scanf("%d", &n);

double x[n], y[n]; // Arrays to store data points

printf("Enter the data points (x y):\n");
for (int i = 0; i < n; i++) {
scanf("%lf %lf", &x[i], &y[i]);
}

double target; // The point at which derivative is to be calculated
printf("Enter the value of x for which you want to calculate the derivative: ");
scanf("%lf", &target);

double derivative = newtonDividedDifference(x, y, n, target);
printf("The derivative at x = %.2lf is: %.4lf\n", target, derivative);

return 0;
}
```