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| Math Central | Quandaries & Queries |
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Question from Danielle, a student: cos2x - 3cosx = 1 |
Hi Danielle,
In your equation cos2(x) - 3 cos(x) = 1 let y = cos(x) and then the equation becomes y2 - 3y - 1 = 0.
Can you solve it now?
If you need more help write back,
Penny
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