Répondre :
(1/4x-1)*(1/4x-1)*pi= (1/16x au carré -1/4x-1/4x +1)*pi = (1/16x au carré -2/4x+1)*pi = (1/16x au carré -1/2x+1)*pi
A=(1/4x-1)*(1/4x-1)*pi
B=(1/4x-1)²
=(1/4x)²-2*1/4x+1²
=1/16x²-1/2x+1
A=B*pi
A=(1/16x²-1/2x+1)*pi
B=(1/4x-1)²
=(1/4x)²-2*1/4x+1²
=1/16x²-1/2x+1
A=B*pi
A=(1/16x²-1/2x+1)*pi