[問題] 數學雙曲線問題已刪文
日前寫到了一題想了很久還是算不出來
http://ppt.cc/LofA
那個上面寫的cos和sin請忽略
我原想用基本定義|PF1-PF2|=2a
假設那點是X和Y 可是後來還是算不出來
拜託各位指點一下 感恩
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