from math import exp
def f(x):
    return(x/(exp(x)-x))
def aireinf(N):
    A=0
    x=0
    h=1/N
    for i in range (1,N+1):
        A=A+h*f(x)
        x=x+h
    return(A)
    
def EncadrAire(N):
    A=0
    B=0
    x=0
    h=1/N
    for i in range (1,N+1):
        A=A+h*f(x)
        x=x+h
        B=B+h*f(x)
    return(A,B)