Di dieu turunan kahiji: f'(k) = d/dk [k * f(k-1) + an] = f(k-1) + k * f'(k-1) Di dieu turunan kadua: f'(k) = f'(k-1) + k * f'(k-1)
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence