Elementary text-book of trigonometry

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Blackie & Son, 1884 - 176 sider
 

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Side 90 - The logarithm of the product of two or more numbers is equal to the sum of the logarithms of the numbers. For, let m and n be two numbers, and x and y their logarithms. Then, by the definition of a logarithm, m — ax, and n = a".
Side 90 - ... the logarithm of a fraction is equal to the logarithm of the numerator minus the logarithm of the denominator.
Side 118 - In any triangle, the sides are proportional to the sines of the opposite angles. That is, sin A = sin B...
Side 149 - Find the length of the side of a square whose area is equal to that of a rectangle the sides of which are 94 '28 and 6720 yards.
Side 89 - The logarithm of a number is the index of the power to which the base of the system must be raised to equal a given number.
Side 158 - The sides of a triangle are in arithmetical progression, and its area is to that of an equilateral triangle of the same perimeter as 3 : 5.

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