[-]

Jyutping kau4 dou6
Pinyin qiú dǎo

Definitions (Wiktionary)
  1. verb, intransitive, verb-object
    to calculate the derivative; to differentiate

求導 [-导]

Jyutping
Pinyin qiú dǎo

Definitions (CC-CEDICT)
  1. to find the derivative (math.)