“余弦”造句

杆的方向通常用方向余弦来表示.
The bar directions are conveniently specified by direction cosines.

这就需要两个正余弦分解器.
This requires two sine - cosine resolvers.

现在让我们来考察最简单的波形,它的剖面图是正弦或余弦曲线.
Let's now examine the simplest wave from where the profile is a sine or cosine curve.