How to prove that $a^2+b^2 \geqslant 2ab$ is true, where $a$ and $b$ are both real numbers?
Simple algebra question - proving $a^2+b^2 \geqslant 2ab$
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algebra-precalculus
inequality
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0I thi$n$k its the other way arou$n$d. – 2015-07-06