tan15 =1/(2+√3)
點變做 tan15=2-√3 ??
我要steps 唔該:D
f.3 maths~one question only
2011-08-28 1:49 am
回答 (2)
2011-08-28 4:15 am
✔ 最佳答案
1/(2+√3) <-[Times (2-√3) both numerator and denominator]=(2-√3)/[(2+√3)(2-√3)
=(2-√3)/[2²-(√3)²]
=(2-√3)/1
=2-√3
參考: Hope I can help you! ^_^ (From me)
2011-08-28 2:41 am
1
tan 15 = ---------
2+√3
1 2-√3
tan 15 = --------- x ---------
2+√3 2-√3
2-√3
tan 15 = -------------
2^2-(√3)^2
2-√3
tan 15 = ---------
4-3
tan 15 = 2-√3
tan 15 = ---------
2+√3
1 2-√3
tan 15 = --------- x ---------
2+√3 2-√3
2-√3
tan 15 = -------------
2^2-(√3)^2
2-√3
tan 15 = ---------
4-3
tan 15 = 2-√3
收錄日期: 2021-04-13 18:11:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110827000051KK00794