use a sum or differenc formula to find the exact value of the trigonometric func

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Mar 3rd, 2015

tan 15 = tan ( 45 - 30 )             according to  the    Rule  or formula of trigonometry 

          =  (tan 45 + tan 30) /( 1 - tan 45 tan 30)

         =  ( 1 + 1/ ) / ( 1 - 1x 1/ )

       = { (  + 1) / } /{ (  - 1 ) / }

        =  (  + 1) /    X    /  ( - 1 )        here  we  changes it in product form. eleminating 

 tan 15        =  (  + 1 ) / (  -1 )     is the final solution     


thanks

If you have any doubt  you can ask me 

Mar 3rd, 2015

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