| 单词 | sine |
| 释义 | sine The ratio in a right-angled triangle between the side opposite to an angle and the hypotenuse. The sine of angle x is written sin x. If a circle of unit radius is drawn, measuring angles anti-clockwise starting from due East, sin x is the vertical coordinate of the point on the circle at angle x from the centre. Sin x fluctuates between a minimum of -1, reached when x = 3π/2 or x = 3π/2 ± n(2π), where n is any integer, and a maximum of +1, reached when x = π/2 or x = π/2 ± n(2π). [This is true measuring x in radians; if x is measured in degrees, sin x has a minimum when x = 270° or x = 270° ± n(360°)], and a maximum when x = 90° or x = 90° ± n(360°). The sine function thus has regular oscillations as x increases. See also: trigonometric function |
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