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If $\sec (\theta+\alpha), \sec \theta, \sec (\theta-\alpha)$ are in arithmetic progression, then $\cos \theta \cdot \sec \frac{\alpha}{2}=$
2.
3. \pm 2
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Options:
2.
3. \pm 2
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Solution:
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Verified Answer
The correct answer is:
$\pm \sqrt{2}$
No solution. Refer to answer key.
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