If $\sec (\theta+\alpha), \sec \theta, \sec (\theta-\alpha)$ are in arithmetic progression, then $\cos…

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 www. android.universityupdates.in $\mid$ www.universityupdates.in $\mid$ www. ios.universityupdates.in www.android.previousquestionpapers.com | www.previousquestionpapers.com | www.ios.previousquestio 4.
  1. $\frac{\sqrt{3}}{2}$
  2. $\frac{1}{\sqrt{2}}$
  3. $\pm {2}$
  4. $\pm \sqrt{2}$

Solution

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Asked in: AP EAMCET 2018 (24 Apr Shift 2)

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