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椭圆的参数方程怎么推导的？
更新时间： 2021-05-24 19:10:45  

1、直角坐标系的椭圆方程是——x2/a2+y2/b2=1，

2、∵cos2t+sin2t=1，

∴x2/a2+y2/b2= cos2t+sin2t，

∴x2/a2 = cos2t ，y2/b2=sin2t，

x2 = a2cos2t ，y2=b2sin2t，

3、于是有椭圆的参数方程——x= acost ，y=bsint。

关键词： 椭圆 参数 方程 怎么 推导

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