In triangle \( A B C ; A=\pi / 3, b=50, c=30, A D \) is a median through \( A \), then \( A D^{2....

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In triangle \( A B C ; A=\pi / 3, b=50, c=30, A D \) is a
\( \mathrm{P} \)
median through \( A \), then \( A D^{2} \) is equal to \( 409 k^{2}, k= \)
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