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One solution.

(cos x)2 - 2cos x = 3

Factor:

(cos x - 3)(cos x + 1)= 0

cos x = {-1, 3}

Solve:

For cos x = -1, x = 180 deg

No solution for cos x = 3

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14y ago

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Q: How many solutions does cos squared minus two cos equal three?
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