M2 數more about tigonometric functions
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csc^2 A+ cos^2 A csc^4 A
E條數點做．．？？ＴＨＸ＾＾
M2 more about tigonometric ...
2009-11-30 12:07 am
回答 (1)
2009-11-30 6:32 am
✔ 最佳答案
Note that cscA = 1 / sinA1 / (csc^2A + cos^2A csc^4A)
= 1 / (1/sin^2A + cos^2A/sin^4A)
= 1 / (sin^2A/sin^4A + cos^2A/sin^4A)
= 1 / [(sin^2A + cos^2A)/sin^4A]
= 1 / (1/sin^4A)
= sin^4A
收錄日期: 2021-04-23 23:19:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091129000051KK01030