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"log" ("log"x), x gt 1...

`"log" ("log"x), x gt 1`

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`"Let"y = "log" ("log"x)`
`rArr (dy)/(dx) = (d)/(dx) "log" ("log"x)`
`=(1)/("log"x)*(d)/(dx)"log"x = (1)/( x "log" x)`
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