TS EAMCET · Maths · Complex Number
If \(\frac{1+i \cos \theta}{1-2 i \cos \theta}\) is purely real then \(\cos ^3 \theta+\sin ^2 \theta+\cos \theta+1=\)
- A \(0\)
- B \(1\)
- C \(2\)
- D \(\frac{3}{4}(2+\sqrt{2})\)
Answer & Solution
Correct Answer
(C) \(2\)
Step-by-step Solution
Detailed explanation
\(Z=\frac{1+i \cos \theta}{1-2 i \cos \theta}\)…
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