Asked by Narayanamma
                Find the orthogonal trajectory of the circle x^2+y^2+2fy +1=0
            
            
        Answers
                    Answered by
            Steve
            
    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
    
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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