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暮暮呀当前离线
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2024-03-13 来自"傲世堂APP"

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霸道灬老凹| 236级

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2024-03-13 来自"傲世堂APP"

坐边sin(A+C)=sin(180-B)=sinB=2sinB/2cosB2，和右边约掉sinB/2，得cosB/2=4sinB/2，tanB/2=1/4，tanB=8/15，最后解cosB

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2024-03-13 来自"傲世堂APP"

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2024-03-13 来自"傲世堂APP"

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