Solve ${cos}^{2} x - 4 cos x + 3$

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Solution

${cos}^{2} x - 4 cos x + 3 = 0$

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

$\Rightarrow cos x = 1$ as it cannot be greater than 1

$\Rightarrow x = 0$

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