Funksiya \( f(x) \) ning differensiali \( df \) funksiya qiymatining o‘zgarishini tasvirlaydi va uning hosilasi \( f'(x) \) bilan bog‘liq. Differensial \( df \) odatda quyidagi formula bilan ifodalanadi: \( df = f'(x) \cdot dx \), bunda \( dx \) - x ning kichik o‘zgarishi