1.(sin2)^2+(sin4)^2+(sin6)^2+......+(sin86)^2+(sin88)^2=
A.22
B.22.5
C.44
D.44.5
更新1:
2.(2-5cos2A)^2 +1的極小值為= A.1 B.2 C.5 D.26
數學急問,請快入.......數學急問,請快入
2010-04-25 6:18 pm
請列步驟:
1.(sin2)^2+(sin4)^2+(sin6)^2+......+(sin86)^2+(sin88)^2=
A.22
B.22.5
C.44
D.44.5
1.(sin2)^2+(sin4)^2+(sin6)^2+......+(sin86)^2+(sin88)^2=
A.22
B.22.5
C.44
D.44.5
回答 (1)
2010-04-25 7:07 pm
✔ 最佳答案
圖片參考：http://j.imagehost.org/0669/ScreenHunter_04_Apr_25_11_06.gif
http://j.imagehost.org/0669/ScreenHunter_04_Apr_25_11_06.gif
2010-04-25 11:59:43 補充：
Correction(1):
http://j.imagehost.org/0015/ScreenHunter_06_Apr_25_11_58.gif
收錄日期: 2021-04-23 20:44:15
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100425000051KK00304