12th Class Mathematics Continuity and Differentiability

  • question_answer 136)
    If   for |x| < 1, prove that        

    Answer:

                Squaring both sides, we have       x2 (1 + y) = y2 (1 + x)       x2 ? y2 = y2 x ? x2 y       (x ? y) (x + y) = xy (y ?x)        x + y = ? xy                                                  


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