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I´m removing the sentence that says Tusi developed an "early Cardan method". This claim is highly misleading, and it doesn´t matter if the source (a non exceptionally neutral one) says exactly that, if you do some research you´ll realise Tusi´s method was geometrical, unlike Cardano´s that was strictly algebraic.
You can check thi source:
Annals of science, Volume 46,page 197,British Society for the History of Science
