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If f(x)=|((x-a)^(4),(x-a)^(3),1),((x-b)^...

If `f(x)=|((x-a)^(4),(x-a)^(3),1),((x-b)^(4),(x-b)^(3),1),((x-c)^(4),(x-c)^(3),1)|" then "f'(x)=lambda.|((x-a)^(4),(x-a)^(2),1),((x-b)^(4),(x-b)^(2),1),((x-c)^(4),(x-c)^(2),1)|`. The value of `lambda` is

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