ln|f(x)|=∑[1,100]ln|x-k|
f'(x)/f(x)=∑[1,100]1/(x-k)
f'(x)=f(x)∑[1,100]1/(x-k)
f'(3)=(x-1)(x-2)(x-4)...(x-100)
=2*(-1)^97*97!
=-2*97!