If three variables , formula 26 , formula 27 and formula 28 are bound by the condition formula 29 for some total function formula 30 , then the following differentials exist . If three variables , Formula 26 , Formula 27 and Formula 28 are bound by condition formula 29 for a total function formula 30 , then the following differentials exist .
Jika tiga pembolehubah, formula 26, formula 27 dan formula 28 terikat dengan syarat formula 29 untuk beberapa fungsi keseluruhan formula 30, maka perbezaan berikut wujud. Jika tiga pembolehubah, Formula 26, Formula 27 dan Formula 28 terikat dengan syarat formula 29 untuk keseluruhan fungsi formula 30, maka perbezaan berikut wujud.