F.4 M2 maths!!

2010-05-24 7:49 am
In tri.ABC, prove
1. cotA+cotB=tanC-cotAcotBtanC
2. secA secB cos C = (tanA+tanB) cotC
3. tanC(tanAtanB-1)=tanB+tanA

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收錄日期: 2021-04-13 17:15:49
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