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Heron's method. Jamshid al-Kashi used a method to solve to find roots of ', a method that was algebraically equivalent to Newton's method, and in which a similar method was found in Trigonometria Britannica, published by Henry Briggs in 1633. His method first appeared in his 1427 publication Miftah al-Hisab (The Key to Arithmetic). Al-Kashi's work was founded on the earlier contributions of the polymath

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