一道sine law(或者cosine law)中学数学题紧急求助!
1个回答
由正弦定理得
sinC/c=sinB/b
所以sin40°/35=sinB/40
sinB=8sin40°/7≈0.735
所以B≈47.3°或B≈132.7°
所以A=92.7°或A=7.3°
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