[" 6.If "cos A=(1)/(7)" and "cos B=(13)/...

[" 6.If "cos A=(1)/(7)" and "cos B=(13)/(14)" where "A" and "B" are acute angle then "A-B" is equal to- "],[[30^(@)(,),45^(@)(,),60^(@)(,),75^(@)(quad )]]

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