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f(x)=x(x-1)(x-2)...(x-99)
lnf(x) =lnx +ln(x-1)+...+ln(x-99)
f'(x)/f(x) = 1/x +1/(x-1) +...+1/(x-99)
f'(x) =[1/x +1/(x-1) +...+1/(x-99)] .x(x-1)(x-2)...(x-99)
f'(0)
=(0-1)(0-2)....(0-99)
=(-1)^99. 99!
=-99!
lnf(x) =lnx +ln(x-1)+...+ln(x-99)
f'(x)/f(x) = 1/x +1/(x-1) +...+1/(x-99)
f'(x) =[1/x +1/(x-1) +...+1/(x-99)] .x(x-1)(x-2)...(x-99)
f'(0)
=(0-1)(0-2)....(0-99)
=(-1)^99. 99!
=-99!
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