MCQ
The value of ${e^{{{\log }_{10}}\tan 1^\circ + {{\log }_{10}}\tan 2^\circ + {{\log }_{10}}\tan 3^\circ + ........... + {{\log }_{10}}\tan 89^\circ }}$ is
  • A
    $0$
  • B
    $e$
  • C
    $1/e$
  • None of these

Answer

Correct option: D.
None of these
d
(d) We have ${e^{{{\log }_{10}}\tan \,\,{1^o} + {{\log }_{10}}\tan \,\,{2^o} + {{\log }_{10}}\,\tan \,\,{3^o} + .......... + {{\log }_{10}}\,\tan \,\,{{89}^o}}}$

$ = {e^{{{\log }_{10}}\,(\tan \,\,{1^o}\,\tan \,\,{2^o}\,\,\tan \,\,{3^o}.....\tan \,\,{{89}^o})}} = {e^{{{\log }_{10}}\,\,1}} = {e^o} $

$= 1$

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