In any triangle \( A B C \), prove that : \[ \frac{b+c}{b-c}=\cot \...

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In any triangle \( A B C \), prove that :
\[
\frac{b+c}{b-c}=\cot \frac{\mathrm{A}}{2} \cot \frac{\mathrm{B}-\mathrm{C}}{2}
\]
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