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7:17 AM
I assume that this question – a simple application of the CS inequality for integrals – is a duplicate, but my search with Approach0 did not find anything suitable.
 
 
2 hours later…
9:27 AM
I have tried both with and without parenthesis. I do not see somthing suitable.
This inequality is mentioned in this answer: Inequalities for combinations of ∫f\int f and ∫(1/f) where m≤f≤M on an interval - but that's multipart question and not really suitable as a duplicate target.
But at least in the process I found some duplicates:
Here is SearchOnMath with and without parenthesis.
The inequality you mentioned is also in this answer: NBHM QUESTION 2013 Riemann integration related question.
But again, that is a multipart question and a PSQ - not suitable as a duplicate target.
 

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