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If tana,tanb are the roots of the equation x square + px + q = 0 (p is not equal to 0) then

Hi, 

   Please provide the options or more info about the question. For your reference, use the following the information from the given question.

   tan a + tan b = – p

   tan a * tan b  = q.

   tan (a + b ) = ( tan a  + tan b ) / ( 1- tan a * tan b  )   = – p / 1- q