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If f: RtoR is a twice differentiable fun...

If `f: RtoR` is a twice differentiable function such that `f"(x)>0` for all `x in R` ,and `f(1/2)=1/2,f(1)=1` then: `f^(prime)(1)>1` (b) `f^(prime)(1)lt=0` (c)`1/2 ltf^(prime)(1)lt1` (d)="" `0ltf^(prime)(1)lt="1/2`

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