Trigonometric questions
Solve the equation for 0o≦x≦360o. Leave your answers in terms ofπor correct to 2 decimal places.
2sinx cosx - sinx + 2cosx - 1 = 0
*360 degrees is larger or equal to x.
*x is larger or equal to 0 degree.
A Maths
2009-01-10 4:13 pm
回答 (2)
2009-01-10 8:55 pm
2009-01-10 6:16 pm
2sinx cosx - sinx + 2cosx - 1 = 0
(2cosx - 1) sinx x + 2cosx - 1 = 0
(2cosx - 1) (sinx x + 1) = 0
2cosx - 1 = 0 or sinx x + 1 = 0
cosx = 1/2 or sinx = -1
x = Pi / 3 or x = 3 Pi / 2
(2cosx - 1) sinx x + 2cosx - 1 = 0
(2cosx - 1) (sinx x + 1) = 0
2cosx - 1 = 0 or sinx x + 1 = 0
cosx = 1/2 or sinx = -1
x = Pi / 3 or x = 3 Pi / 2
參考: Myself
收錄日期: 2021-04-23 20:37:37
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090110000051KK00240