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019770060000800_0
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An introduction to plain trigonometry, with its application to heights and distances. Containing an Explanation of the three Varieties of right angled Triangles, and the four Cases of Oblique, together with a Variety of Questions interspersed by way of Exercise. By Richard Cockrel, Teacher of the Free School, at Lartington.
printed and sold by M. Heavisides, for the author; by Messrs. Law and Son, Ave Maria Lane; and Mr. D. Taylor, No. 35. Union Street, Bishopgate-Street London; Mr. Pine, Bristol; Messrs. Wilson and Spence, York ; and Mr. Nicholson, Barnardcastle
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