In a \( \triangle A B C \), if \( b=20, c=21 \) and \( \sin A=\frac{3}{5} \), then \( a= \)

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In a \( \triangle A B C \), if \( b=20, c=21 \) and \( \sin A=\frac{3}{5} \), then \( a= \)
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