Maths

Find the orthogonal trajectory of the circle x^2+y^2+2fy +1=0

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  1. Hmmm. The orthognal curves to a circle are its radii.
    So, since your circle is

    x^2+(y+f)^2 = r^2

    you want all the lines through (0,f)

    That would be y=kx+f

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