余弦函数
cosine function Denoted $\cos \theta$, defined as the ratio of the adjacent side to the hypotenuse in a right triangle, or the x-coordinate on the unit circle.
CSCA 数学 考试术语
cosine function Denoted $\cos \theta$, defined as the ratio of the adjacent side to the hypotenuse in a right triangle, or the x-coordinate on the unit circle.
CSCA 数学 考试术语