History of Hindu Mathematics: A Source Book v2.c17.s16.68
History of Hindu Mathematics: A Source Book v2.c17.s16.68
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v2.c17.s16.68
(2) An obvious solution of $13x² - 4 = y²$ is x = 1, y = 3. Then dividing out by 4, as shown before, we get a solution of the equation 13x² - 1 = y² as (1/2, 3/2).