American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, Logan, George Wood, 1868-1915, United States. Navy Dept. Bureau of Equipment · Washington, Govt. Print. Off · leaf 280
procal of the sine, the secant is the reciprocal of the cosine, the cotangent is the reciprocal of the tangent, and the tangent equals the sine divided by the cosine. The complement of an angle is equal to 90° minus that angle, and thus in the triangle ABC theangle B is the complement of A. The… … Hence it may be seen that the sine of an angle is the cosine of the complement of that angle; thetangent of an anjjle is the cotangent of its complement, and the secant of an angle is the cosecant ofits complement. The functions of angles vary in sign accordingto the quadrant in which the angles…
Navigation · Nautical astronomy
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