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[" 12.If "f:R rarr R" is a twice differe...

[" 12.If "f:R rarr R" is a twice differentiable function such that "f^(*)(x)>0" for all "x in R" and "],[i((1)/(2))=(1)/(2),f(1)=1" ,then "],[[" A) "f'(1)<=0," B) "01]]

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