Question

log (tan5) + log (tan25)+ log (tan65)+log(tan 85)=

Answer 1

Hi...☺

Here is your answer...✌
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$log( \tan5 ) + log( \tan25 ) + log( \tan65 ) \\+ log( \tan85 ) \\ \\ = log( \tan5 \times \tan25 \times \tan65 \times \tan 85 ) \\ \\ = log( \tan5 \times \tan25 \times \cot25 \times \cot 5 ) \\ \\ = log(1) \\ \\ = 0$