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Prove that the circles z bar z +z( bar a...

Prove that the circles `z bar z +z( bar a _1)+bar z( a_1 )+b_1=0 ,b_1 in R and z bar z +z( bar a _2)+ bar z a_2+b_2=0,` `b_2 in R` will intersect orthogonally if `2R e(a_1 bar a _2)=b_1+b_2dot`

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