余弦函数
cosine function In a right triangle, the ratio of the length of the adjacent side to the hypotenuse; on the unit circle, the $x$-coordinate of the point at angl
CSCA 数学 考试术语
cosine function In a right triangle, the ratio of the length of the adjacent side to the hypotenuse; on the unit circle, the $x$-coordinate of the point at angl
CSCA 数学 考试术语