Discussion
The envelope of a family of curves is a curve that
Answer: B
The envelope is tangent to each curve of the family at some point, and is found by eliminating the parameter between \( F(x,y,c) = 0 \) and \( \partial F/\partial c = 0 \). The orthogonal-crossing curve is a member of the orthogonal family instead, and the locus of centres of curvature is the evolute
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