Réponses

2013-12-29T23:05:47+01:00
1) A=x^2-(1/4)*pi*x^2=x^2(1-pi/4)

2) A'=(2x)^2-8*A=4x^2-x^2(8-2pi)=x^2(4-8+2pi)=x^2(-4+2pi)=2(pi-2)x^2