If y=(x+a)(x+b)(x+c)(x+d)/(x-a)(x-b)(x-c)(x-d) then the value of dy/dx is
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(x-a)(x-b)(x-c)(x-d).....(x-x)(x-y)(x-z)=(x-a)(x-b)(x-c).....(0)(x-y)(x-z) =0
or
(x-a) (x-b) (x-c) (x-d)(x-e)....... (x-z) =0
because (x-x) =0
If we multiply any number by 0 then answer is 0
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