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The maximum value of the function f(x)=(...

The maximum value of the function `f(x)=((1+x)^(0. 6))/(1+x^(0. 6))` in the interval `[0,1]` is (a)`2^(0. 4)` (b) `2^(-0. 4)` (c)1 (d) `2^(0. 6)`

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