find `dy/dx`  for `y=log[lnx]`



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Posted on (Answer #1)


To take the derivative of y with respect to x,  apply the rule `(log_b u)'= 1/(u lnb)*u'` .

Since the base of logarithm (log) is not written, it indicates that its base is 10.





Then, apply the rule `(lnu)'=1/u*u'` .






Hence, `dy/dx=1/(xln10lnx)` .

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