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Доведи тотожність. a) (x^3-c^3 )/(x^2+ xc+c^2 ) = x – c; ((x- c)(x^2+ xc+c^2) )/(x^2+ xc+ c^2 ) = x – c; x – c = x – c. Тотожність доведено. б) (x^3+c^3 )/(x+ c) = x2 – xc + c2; ((x+ c)(x^2- xc+c^2) )/(x+ c) = x2 – xc + c2; x2 – xc + c2 = x2 – xc + c2. Тотожність доведено.