中文说明：
可以求出B样条曲线的导数及切线，有一定的参考价值。
English Description：
The derivative and tangent of B-spline curve can be obtained, which has a certain reference value.
The derivative and tangent of B-spline curve can be obtained
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中文说明：
可以求出B样条曲线的导数及切线，有一定的参考价值。
English Description：
The derivative and tangent of B-spline curve can be obtained, which has a certain reference value.
daoshi_Bspline
..............\daoshi_Bspline.m