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If the three ellipses x ^2/ ai ^2 ...

If the three ellipses `x ^2/ a_i ^2 + y ^2/ b_i ^2 = 1 , i = 1 , 2 , 3` have a common tangent, then the value of `|[a_1 ^2 b_1 ^2 1], [a _2 ^2 b_2 ^2 1], [a _3^2 b _3^2 1]| =`

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