def interscet(f,g,a,b,eps):
    c = (a+b)/2
    if (f(c) - g(c)) > eps:
        if (f(c) - g(c)) > 0:
            intersect(f,g,a,c,eps)

        if (f(c) - g(c)) < 0:
            intersect(f,g,c,b,eps)

    else:
        return