F.4 M2 maths！！

👨🏻‍🏫 學術台數學

Lun

2010-05-30 10:07 pm

In tri. prove
sinA+sinB-sinC=4sinA/2sinB/2cosC/2

solve
sinx-sin5x+sin9x=0,,,for o<=x<=pie

回答 (1)

STEVIE-G™

2010-05-30 10:43 pm

✔ 最佳答案

As follows:

圖片參考：http://i707.photobucket.com/albums/ww74/stevieg90/01-101.jpg

圖片參考：http://i707.photobucket.com/albums/ww74/stevieg90/02-87.jpg

2010-05-30 15:24:08 補充：
http://i707.photobucket.com/albums/ww74/stevieg90/01-101.jpg
http://i707.photobucket.com/albums/ww74/stevieg90/02-87.jpg

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