The minimum value of \( \cos 2 \theta+\cos \theta \) of real values of \( \theta \) is (a) \( -\...

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The minimum value of \( \cos 2 \theta+\cos \theta \) of real values of \( \theta \) is
(a) \( -\frac{9}{8} \)
(b) 0
(c) \( -2 \)
(d) none of these
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