圆锥曲线是平面解析几何的重要内容,常与代数、几何、三角等知识相联系,对同学们能力要求较高,解题时易出错,有的错误还不易察觉.下面对同学们易忽视的问题举例说明,以期帮助同学们避免一些错误发生.1对概念理解模糊致误例1动点M(x,y)满足(x-sinα)2+(y-cosα)2=|xsinα+ycosα Conical curve is an important content of plane analytic geometry. It is often associated with algebra, geometry, triangles and other knowledge. It has high requirements for students’ ability, and it is easy to make mistakes when solving problems. Some errors are not easy to perceive. The following students are easy to ignore Examples of problems are illustrated in order to help students avoid some mistakes. 1 Misconceptions about conceptual understanding 1 Momentum M(x,y) satisfies (x-sinα)2+(y-cosα)2=|xsinα+ycosα