P1 Help Watch

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Reptile
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#1
Report Thread starter 14 years ago
#1



Kind of stuck here. Any help would be greatly appreciated
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Cirsium
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#2
Report 14 years ago
#2
sin^2 + cos ^2 = 1

Therefore 3 sin^2 x = 1 - sin^x
Therefore 4 sin ^ x = 1
Therefore sin ^x = 1/4
Therefore sin x = 1/2
Therefore x = sin-1 1/2 = pi/6 or 5pi / 6
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RichE
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#3
Report 14 years ago
#3
(Original post by Bekaboo)
sin^2 + cos ^2 = 1

Therefore 3 sin^2 x = 1 - sin^x
Therefore 4 sin ^ x = 1
Therefore sin ^x = 1/4
Therefore sin x = 1/2
Therefore x = sin-1 1/2 = pi/6 or 5pi / 6
You're going to miss solutions by excluding the possibility sin x = -1/2 at line 4
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