A:y=1−1x−1
B:y=|x﹣1|
C:y=x2﹣4x+8
D:y=1−x
We carefully compared the result of the first experiment with_______ of the second one.
设二次函数f(x)=ax2+bx+c(a,b,c为常数)的导函数为f′(x).对任意x∈R,不等式f(x)≥f′(x)恒成立,则b2a2+c2的最大值为 ____.