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设含有一个参数α的曲线族方程为: F(x,y,α)=0 (1) 如果该曲线族有包络,则此包络曲线是由方程(1)和方程
Let the curve family equation containing a parameter α be: F(x,y,α)=0 (1) If the curve family has an envelope, the envelope curve is given by equation (1) and equation