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If the function f:R rarr R defined by f(...

If the function f:R rarr R defined by `f(x)=(4^(x))/(4^(x)+2)` then show that `f(1-x)=1-f(x)` and hence deduce the value of `f( 1/ 4 )+2f( 1 /2 )+f( 3/4 )`.

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