| 单词 | cosine |
| 释义 | cosine The ratio in a right-angled triangle between the side adjacent to an angle and the hypotenuse. The cosine of angle x is written cos x. If a circle of unit radius is drawn, measuring angles anti-clockwise from due East, cos x is the horizontal coordinate of the point on the circle at angle x. The cosine is thus an oscillatory function. If x is measured in radians, cos x fluctuates between a minimum of -1, reached when x = π or x = π ± n(2π), where n is any integer, and a maximum of +1, reached when x = 0 or x = ±n(2π). If x is measured in degrees, cos x has a minimum of -1 when x = 180° or x = 180° ± n(360°), and a maximum of +1 when x = 0° or x = ± n(360°). See also: trigonometric function |
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