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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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MathematicsTrigonometric Ratios & IdentitiesAP EAMCETAP EAMCET 2018 (24 Apr Shift 2)
Options:
  • A $\frac{\sqrt{3}}{2}$
  • B $\frac{1}{\sqrt{2}}$
  • C $\pm {2}$
  • D $\pm \sqrt{2}$
Solution:
2457 Upvotes Verified Answer
The correct answer is: $\pm \sqrt{2}$
No solution. Refer to answer key.

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