AB=2√3,BC=4, B=30°
cos B=BC²+AC²-AB²/2BC²×AC
√3/2=16+(2√3)²-AC²/2×4×2√3
AC=2
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AB=2√3,BC=4, B=30°
cos B=BC²+AC²-AB²/2BC²×AC
√3/2=16+(2√3)²-AC²/2×4×2√3
AC=2