Cho tam giác $ABC$. CMR: $\sum \left ( \frac{1}{sinA}-cotA \right ) \geq \sqrt{3}$
Edited by melodias2002, 19-01-2018 - 00:09.
$\sum \left ( \frac{1}{sinA}-cotA \right ) \geq \sqrt{3}$
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Started By melodias2002, 19-01-2018 - 00:09
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