If a,b,c,d be the sides of a quadrilater...

If a,b,c,d be the sides of a quadrilateral and g(x)=f[f{f(x)}], where `f(x)=1/(1-x)` then `d^2/(a^2+b^2+c^2`is equal to

`gtg(3)`

`ltg(3)`

`gtg(2)`

`ltg(4)`

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