def NRroot(x,f,dfdx):
    x_val = [0]
    x_diff = 1
    counter = 0

    while True:
        x = x-f(x)/dfdx(x)
        x_val.append(x)
        x_diff = x_val[len(x_val)-1] - x_val[len(x_val)-2]
        if x_diff > 10**(-6):
            return x_val[:-1]

        print([(counter,x,x_diff)])
        counter += 1
    return x_val