Question 1162513
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On Cauchy-Schwartz inequality see this Wikipedia article


https://en.wikipedia.org/wiki/Cauchy%E2%80%93Schwarz_inequality



After reading <Y>what the Cauchy-Schwartz inequality is</U>, verify it on your own for the given example.


If after reading this passage, you still will have questions, you may ask them to me.


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I am open to get your "thanks" for pointing a right source for your reading . . .