Agar u va v bitta o'zgaruvchining har qanday ikkita differensiallashtirilgan funksiyalari bo'lsa, unda differensiallashtirish qoidasi bilan bizda; d/dx ((uv) = u ((dv/dx) + v ((du/dx) Ikkala tomonni integratsiyalash orqali biz; uv = ∫u ((dv/dx) dx + ∫v ((du/dx) dx yoki ∫u ((dv/dx) dx = uv-∫v ((du/dx) dx.............1) Endi keling, u = u ((fx) va dv/dx = g (((x) ni ko'rib chiqaylik. Shu sababli, biz endi yozishimiz mumkin; du/dx = f' ((x) va v = ∫g (((x) dx Shuning uchun, hozir tenglama 1 ga aylanadi; ∫f
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