Well, at point P, the velocity vector QP is perpendicular to the line QP, 1 so the sine of that angle is one.

点P，速度向量,垂直于直线，所以该角的正弦值为。

youdao

The state space may be thought of as a big vector space with each basis element spanning the possible states of one system element (say a memory register or the CAM Angle).

状态空间可能被认为是一个大向量空间，其每个基本元素跨越一个系统元素的可能状态(比方说内存寄存器或偏心角)。

youdao

I put a vector sign over here, because you have to take the cross-product between the two, so you take the... sine of this Angle has to be taken into account.

在此加一个向量标志，因为必须要，算这俩的乘积，所以，sin这个角度必须，考虑在内。

youdao