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dc16 (1827)

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For the second one ....

 

take out  x^4 Common in the bracket ..

 

so question will convert into ..

 

 

                        [  x-5 ]   /   [ 1 + x-4 ]3/4

 

 

Now simply put 1 + x-4   EQUAL TO some ( t )

 

 

as it is of the form f '(x) / f(x)

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