• 1. arc secant: 反正割 | 横竖割
• 2. arc-hyperbolic secant: 反双曲正割

• 1.The relation between the maximum radial error and arc radius and approach step-length in the secant mode of arc data interpolation in CNC system is detailed.
  并讨论了圆弧分象限“均差”割线方式插补时，圆弧的起始步距角和终止步距角、起始象限步数和终止限步数；
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