作业帮余弦定理,数学题a^2+c^2=b^2+ac 求∠C△ABC中,a^2+c^2=b^2+ac,且a/c=根号三+1/2,求∠C的大小=[(√3/2)/tanC]+0.5所以tanC=1/2C=arctan(1/2) 这里不是很懂
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![余弦定理,数学题a^2+c^2=b^2+ac 求∠C△ABC中,a^2+c^2=b^2+ac,且a/c=根号三+1/2,求∠C的大小=[(√3/2)/tanC]+0.5所以tanC=1/2C=arctan(1/2) 这里不是很懂](/uploads/image/z/10134742-22-2.jpg?t=%E4%BD%99%E5%BC%A6%E5%AE%9A%E7%90%86%2C%E6%95%B0%E5%AD%A6%E9%A2%98a%5E2%2Bc%5E2%3Db%5E2%2Bac+%E6%B1%82%E2%88%A0C%E2%96%B3ABC%E4%B8%AD%2Ca%5E2%2Bc%5E2%3Db%5E2%2Bac%2C%E4%B8%94a%2Fc%3D%E6%A0%B9%E5%8F%B7%E4%B8%89%2B1%2F2%2C%E6%B1%82%E2%88%A0C%E7%9A%84%E5%A4%A7%E5%B0%8F%3D%5B%28%E2%88%9A3%2F2%29%2FtanC%5D%2B0.5%E6%89%80%E4%BB%A5tanC%3D1%2F2C%3Darctan%281%2F2%29+%E8%BF%99%E9%87%8C%E4%B8%8D%E6%98%AF%E5%BE%88%E6%87%82)
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