# The Essentials of Plane and Spherical Trigonometry

Leach, Shewell, and Sanborn, 1887 - 151 pàgines

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Pàgina 105 - If the function is a sine, since the sine of an angle is equal to the sine of its supplement...
Pàgina 102 - I. The sine of the middle part is equal to the product of the tangents of the adjacent parts.
Pàgina 75 - In any triangle the square of any side is equal to the sum of the squares of the other two sides minus twice the product of these two sides and the cosine of their included angle.
Pàgina 74 - In every plane triangle, the sum of two sides is to their difference as the tangent of half the sum of the angles opposite those sides is to the tangent of half their difference.
Pàgina 94 - If two sides of a spherical triangle are unequal, the angles opposite them are unequal, and the greater angle lies opposite the greater side ; and conversely.
Pàgina 55 - ... the logarithm of a fraction is equal to the logarithm of the numerator minus the logarithm of the denominator.
Pàgina 54 - The logarithm of a product is equal to the sum of the logarithms of its factors.
Pàgina 48 - In the formula sin (x + y) = sin x cos y + cos x sin y...
Pàgina 113 - 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 those sides into the cosine of their included angle ; that is, (1) cos a = cos b...
Pàgina 94 - The sum of the angles of a spherical triangle is greater than two and less than six right angles ; that is, greater than 180° and less than 540°. (gr). If A'B'C' is the polar triangle of ABC...