W(x) = x6- 6xs + 15*4 - 20x3 + 15*2 -6x + l W(l) = l6 - 6 • l5 + 15 • l4 - 20 • l3 + 15 • l2 - 6 • 1 + 1 W(l) = 0
W' (*) = 6xs - 30x4 + 60x3 - 60x2 +30x-6 W'( 1) = 6 • ls - 30 l4 + 60 l3 - 60 • l2 + 30 • 1 - 6
W'( 1) = O
W" (x) = 30*4 - 120x3 + 180x2 - 120x + 30 W"(l) = 30 • l4 - 120 • l3 + 180 • l2 - 120 1 + 30
W” (1) = O
W& (*) = 120*3 - 360*2 + 360* - 120 Jł^Cl) = 120 • l3 - 360 • l2 + 360 • 1 - 120 W^Cl) = O
W*4>(*) = 360*2 - 720* + 360 ITW(l) = 360 • l2 - 720 • 1 + 360
W^C*) = 720* - 720 W^Cl) = 720 • 1 - 720 W^Cl) = O
*6 - 6*5 + 15*4 - 20*3 + 15*2 - 6* + 1 = (* - l)6