If 1. lim2-+0 -x2 4 2x4hx2-2 f(x) = -x2+ 2x, h which of the following determines the deriva- -(x+h)2+2(xth)+x2 -2x tive of f(x)? 2. lim2-40 h 3. limn - 0 h 4 - (xth)2+2(ath)+12-2x h 0 5. limn +0 (xth)2+2(xth)+x2-2x h h