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" TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE. "
A System of Geometry and Trigonometry: Together with a Treatise on Surveying ... - Seite 27
von Abel Flint - 1804 - 168 Seiten
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A System of Geometry and Trigonometry: Together with a Treatise on Surveying ...

Abel Flint - 1818 - 184 Seiten
...: 0.37044=60° 30'. CASE III. Two Sides and their contained Angle given, to find the ether Jingles and Side. Fig. 49. The solution of this CASE depends...Tangent of half the Sum of the two opposite Angles ; To th« Tangent of half the Difference between them. Add this half difference to half the Sum of the Angles...
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A Treatise on Practical Surveying: Which is Demonstrated from Its First ...

Robert Gibson - 1818 - 502 Seiten
...wholes are as their halves, ie AH : IH : : CE : ED, that is, as the snm of the two sides AB and BC, is to their difference ; so is the tangent of half the sum of the two unknown angles A and C, to the tangent of half their difference. QED THEOREM HI. In any right-lined...
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New American Practical Navigator

1821 - 708 Seiten
...same angle*. Thus, in the triangle ABC, if we call AB the base, it will he as the sum of AC and CB is to their difference, so is the tangent of half the sum of the angles ABC, BAG', to the tangent of half their difference. Dem. With the longest leg CB as radius,...
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American Edition of the British Encyclopedia: Or, Dictionary of ..., Band 12

William Nicholson - 1821 - 356 Seiten
...of either angle to the co-tangent of the other angle. As the sum of the sines of two unequal arches is to their difference, so is the tangent of half the sum of those arches to the tangent of half their difference : and as the sum of their co-sines is to their...
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British Encyclopedia: Or, Dictionary of Arts and Sciences ..., Band 12

William Nicholson - 1821 - 356 Seiten
...of either angle to the co-tangent of the other angle. As the sum of the sines of two unequal arches is to their difference, so is the tangent of half the sum of those arches to the tangent of half their difference : and as the sum of their co-sines a to their...
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A treatise on navigation, and nautical astronomy

Edward Riddle - 1824 - 572 Seiten
...triangle. Or the angles opposite the given sides may be determined as follows. As the sum of the given sides is to their difference, so is the tangent of half the sum of their opposite angles to the tangent of half the difference of the same angles, (Trig. Prop. 6.) And...
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The New American Practical Navigator: Being an Epitome of Navigation ...

Nathaniel Bowditch - 1826 - 732 Seiten
...THEOREM HI. . In every plane triangle, it will be, as the sum of any two sides is to their difference, su is the tangent of half the sum of the two opposite angles to the tangent 'tif half their difference (by art. u'J, Geom.) THEOREM IV. As the base of any plane triangle is to...
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The New American Practical Navigator: Being an Epitome of Navigation ...

Nathaniel Bowditch - 1826 - 764 Seiten
...the tame angla. Thus, in the triangle ABC, if we call AB the base, it will be as the sum of AC and CB is to their difference, so is the tangent of half the sum of the angles ABC, ВАС, to the tangent of half their difference. Dan. With the longest leg CB as radius,...
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Mathematical and Astronomical Tables: For the Use of Students of Mathematics ...

William Galbraith - 1827 - 412 Seiten
...45. In a plane triangle when the two sides and contained angle are given. I. As the sum of the given sides, Is to their difference ; So is the tangent of half the sum of the opposite angles, To the tangent of half their difference. Half the difference added to half the sum...
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A Concise System of Mathematics ...

Alexander Ingram - 1830 - 458 Seiten
...180°, and take half the remainder, to get half the sum of the unknown angles. Then as the sura of the sides is to their difference, so is the tangent of half the sum of the unknown angles to the tangent of half their difference. Having thus found the half difference, add...
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