TS EAMCET · Maths · Trigonometric Equations
If \(\cos ^3 \theta+\cos ^3\left(\frac{2 \pi}{3}+\theta\right)+\cos ^3\left(\frac{4 \pi}{3}+\theta\right)\) \(=\alpha \cos 3 \theta\), then \(\alpha\) is equal to
- A \(\frac{1}{4}\)
- B \(\frac{3}{4}\)
- C \(\frac{5}{4}\)
- D \(\frac{7}{4}\)
Answer & Solution
Correct Answer
(B) \(\frac{3}{4}\)
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