from sympy import *



def MaxBerivative(a):
    i = -2
    max = a.subs(x,i)
    while (i <= 2):
        if (max < a.subs(x,i)):
            max = a.subs(x,i)
        i += 0.01
    print(max)
    return str(max)


f = open('D:\\Degree_Derivative.txt', 'r', encoding="utf-8")
Degree = f.readline()
f.close()
print(Degree)

x, y, z = symbols('x y z')
init_printing(use_unicode=True)
Berivative = diff(x/(x*x+1), x, Degree)


max = MaxBerivative(Berivative)
max = str(round(float(max),2))

print(max)

g = open('D:\\test1.txt','w', encoding="utf-8")
g.write(max)
g.close()