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C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
A Treatise on Practical Surveying: Which is Demonstrated from Its First ... - Σελίδα 116
των Robert Gibson - 1818 - 478 σελίδες
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## The Mathematician

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