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## Homework Statement

suppose f(x) is monotonely decreasing and positive on [2,+∞),

please compare [∫f(t)dt]^2 and ∫[f(t)]^2dt,

here "∫ "means integrating on the interval [2,x]

## Homework Equations

none

## The Attempt at a Solution

Maybe the second mean value thereom of integral is helpful.

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