In a triangle \( A B C \), if the median and altitude from \( A \) trisect angle \( A \), then \....

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In a triangle \( A B C \), if the median and altitude from
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\( A \) trisect angle \( A \), then \( |\mathrm{B}-\mathrm{C}|= \)
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(1) \( 15^{\circ} \)
(2) \( 22 \frac{1}{2}^{\circ} \)
(3) \( 30^{\circ} \)
(4) \( 45^{\circ} \)


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