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2 tan3x= -4
最後有6個答案.....~~
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2011-03-09 5:34 am
回答 (3)
2011-03-13 12:21 am
✔ 最佳答案
tan 3x =-23x = -63.4
3x = (360-63.4)=296.6
or =(180-63.4)=116.6
or =(360+360-63.4)=656.6
or =(360+180-63.4)=476.6
or =(360+360+360-63.4)=1016.6
or =(360+360+180-63.4)=836.6
0 <= x <= 360
x= {38.87, 98.87, 158.87, 218.87, 278.87, 338.87}
2011-03-09 6:00 am
0 < x < 360
0 < 3x < 1080
......
0 < 3x < 1080
......
2011-03-09 5:53 am
tan 3x = - 2
3x = arctan (-2) = -63.4 degree
that is 3x = 116.6, 296.6, 476.6, 656.6, 836.6, 1016.6, 1196.6, ........
so x = 38.9, 98.9, 158.9, 218.9, 278.9, 338.9, 398.9,.......
For 0 < x < 360, x = 38.9, 98.9, 158.9, 218.9, 278.9, 338.9 (total 6 answers.)
3x = arctan (-2) = -63.4 degree
that is 3x = 116.6, 296.6, 476.6, 656.6, 836.6, 1016.6, 1196.6, ........
so x = 38.9, 98.9, 158.9, 218.9, 278.9, 338.9, 398.9,.......
For 0 < x < 360, x = 38.9, 98.9, 158.9, 218.9, 278.9, 338.9 (total 6 answers.)
收錄日期: 2021-04-24 09:47:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110308000051KK01433