I have to justify that the envelope of a uniparametric family represented by [tex]f(x,y,c)=0[/tex] is the solution to the next system(adsbygoogle = window.adsbygoogle || []).push({});

[tex]f(x,y,c)=0, \frac{\partial f(x,y,c)}{\partial c}=0[/tex].

How I justify it, I don't know how to justify at all!

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# Homework Help: Envelope of a family of curves.

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