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In a triangle prove that
Tags: Inequality
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prove that![\[\frac{4}{9} \sum \sin B \sin C \leq \prod \cos \frac{B-C}{2} \leq \frac{2}{3} \sum \cos A\]](https://www.math.tolaso.com.gr/wp-content/ql-cache/quicklatex.com-64a2cc76c428c7b66f394bb70b9c211b_l3.png "Rendered by QuickLaTeX.com")