
Re: [其他] 三角函數求解

: 第六題解不出來
6.tan(theta)
=(1+sqrt2)/(2+sqrt2)
=(1+sqrt2)(2-sqrt2)/2
=(sqrt2)/2=1/sqrt2
cos(theta)=(sqrt2)sin(theta)...(1)
原式
=cos(theta)+sin(theta)
=sin(theta)[(sqrt2)+1]...代入(1)
=[1/(sqrt3)][(sqrt2)+1]
=[(sqrt3)/3][(sqrt2)+1]...ans
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 61.58.103.35
※ 文章網址: https://www.ptt.cc/bbs/Math/M.1504665953.A.552.html
→
09/06 10:52, , 1F
09/06 10:52, 1F
→
09/06 11:04, , 2F
09/06 11:04, 2F
※ 編輯: wayne2011 (61.58.103.35), 09/06/2017 11:11:40
討論串 (同標題文章)