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Let g(x) = f(x) + f(1 – x) and f  (x) > 0, x  (0, 1). If g is decreasing in the interval (0,  ) and increasing in the interval (  , 1), then tan –1 (2  ) +                    1 tan 1 tan 1 1 is equal to -

1. 
2. 4 5 
3. 4 3 
4. 2 3 

Correct answer: 

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