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雄中段考題

雄中段考題

18.
(1)設分別為銳角ABC之三內角,證明:cotcot+cotcot+cotcot=1
(2)cos50sin60sin70+cos60sin50sin70+cos70sin50sin60之值為何?

請教第18題的(2)如何用(1)的結果得到答案

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2019-3-5 17:00

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