If \( f(x)+2 f(1-x)=x^{2}+2 \forall x \in R \) and \( f(x) \) is a differentiable function, then...

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If \( f(x)+2 f(1-x)=x^{2}+2 \forall x \in R \) and \( f(x) \) is a differentiable function, then the value of \( f^{\prime}(8) \) is
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