Elements of Trigonometry: Plane and Spherical

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Sheldon & Company, 1877 - Trigonometry - 201 pages
 

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Page 62 - What was the perpendicular height of a balloon, when its angles of elevation were 35 and 64, as taken by two observers on the same level, at the same time, both on the same side of it, and in the same vertical plane ; the distance between the two observers being 880 yards ? Ans., 935.757 yards.
Page 94 - In a spherical triangle the cosine of any side is equal to the product of the cosines of the other two sides plus the product of the sines of these two sides and the cosine of their included angle.

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