[線代] cramer's rule
這題可以幫我解答嗎
實在有點不懂
For the triangle in the accompanying figure
Use trigonometry to show that
bcosγ +ccosβ=a
ccosα+acosγ=b
acosβ+bcosα=c
and then apply Cramer's rule to show that
cosα=(b^2+c^2-a^2)/2bc
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我會用了 謝謝
※ 編輯: funnymandui 來自: 119.77.252.36 (10/30 23:12)
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