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Derivative of the function f(x) = log5 (...

Derivative of the function `f(x) = log_5 (log_7(x) )` and ` x gt 7` is :

A

`(1)/((x log 5)(log7)(log_7x))`

B

`(1)/(x(log5)(log7))`

C

`(1)/(x log x) `

D

none of these

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