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[" 327.Let "f:[0,2]rarr R" be a twice di...

[" 327.Let "f:[0,2]rarr R" be a twice differentiable function such "],[" that "f''(x)>0" for all "x in(0,2)" .If "phi(x)=f(x)+f(2-x)," then "],[" phi is "],[" (1) decreasing on "(0,1)" and increasing on "(1,2)],[" (2) increasing on "(0,2)],[" (3) increasing on "(0,1)" and decreasing on "(1,2)],[" (4) decreasing on "(0,2)]

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