TS EAMCET · Maths · Sequences and Series
\(\theta\) and \(\alpha\) lie in \(Q_3\). If \(\cos (\theta-\alpha), \cos \theta, \cos (\theta+\alpha)\) are in harmonic progression, then \(\cos \theta \sec \frac{\alpha}{2}=\)
- A \(-\sqrt{2}\)
- B \(\sqrt{2}\)
- C \(-\sqrt{3}\)
- D \(\sqrt{3}\)
Answer & Solution
Correct Answer
(B) \(\sqrt{2}\)
Step-by-step Solution
Detailed explanation
Given, \(\cos (\theta-\alpha), \cos \theta, \cos (\theta+\alpha)\) are in HP…
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