guyz
its much simpler by unit circle method
The gvn eqns represent
2 unit circles,
one wid centre 0,4
anoder centre 1,0
max dist= dist between centres + r1 +r2
=sqrt(17)+2
min dist simlarly is dist betw centre-r1-r2
=sqrt(17)-2
difference between max and min dist is
4
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