6Cos^2 x+5 Sinx=0
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A.Maths,,,Last Question
2007-11-22 4:15 am
回答 (1)
2007-11-22 4:37 am
✔ 最佳答案
6Cos^2 x+5 Sinx=06(1-sin^2 x) + 5sinx = 0
6sin^2 x - 5sinx - 6 = 0
(2sinx -3)(3sinx + 2) = 0
sinx = 3/2 (rejected, as |sinx| <=1) or sinx = -2/3
x = 221.81 or 318.19 (2 d.p.)
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