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Let f(x)=(sqrt2^x -2)/(sqrt2^x +2) then ...

Let `f(x)=(sqrt2^x -2)/(sqrt2^x +2)` then if the graphs of `y=f(x)` and `y=f(4x)` are symmetrical about the points `(a_1,0)` and `(a_2,0)` respectively then `a_2/a_1=`

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