differentiation

Question: Derivative of the function $f(x) = {\log _5}({\log _7}x)$, $x > 7$ is



1) $\frac{1}{{x({\rm{In}}\,{\rm{5)(In}}\,{\rm{7)(lo}}{{\rm{g}}_{\rm{7}}}x)}}$
2) $\frac{1}{{x({\rm{ln}}\,{\rm{5)(ln}}\,{\rm{7)}}}}$
3) $\frac{1}{{x(In\,x)}}$
4) None of these
Solution: Explanation: Explanation
standard-differentiation

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