...line then you can find the answer by compound angle . 2009-02-24 23:23:30 補充: *cos ( alp .) = 1 - 2sin^2 ( alp ./2 ) 2sin^2 ( alp ./2) = 1 - cos( alp .) sin ( alp .) = 2 sin ( alp ./2) cos...
...檢舉 此資源網站資料豐富和全面,有助學生全面認識中國文化! The Alps 發表於 2011-06-07 15:14 檢舉 內容豐富,資料涵蓋文史哲,無論作為備課...