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The domain of the function f(x)=ln | ln x| , is

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Solution:     left | ln x 
ight | is well defined for  (0,infty ). but

                  f(x)=ln left | ln x 
ight |  is not defined  for x=1.

                 	herefore      D(f)=(0,1)cup (1,infty ).

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Deependra Verma

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