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W`(x)=ak*(x-x0)^(k-1) W`(x0)=0
W``(x)=ak(k-1)(x-x0)^(k-2) W``(x0)=0
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W^(k-1)(x)=a*k*(k-1)*(k-2)*...(k-(k-2))*(x-x0)^1 W^(k-1)(x0)=0
W^(k)(x)=a*k*(k-1)*...*(1)*1 czyli W^(k)(x0)≠0