TS EAMCET · Maths · Trigonometric Equations
\(\cos \frac{\pi}{7}-\cos \frac{2 \pi}{7}+\cos \frac{3 \pi}{7}-\cos \frac{4 \pi}{7}+\cos \frac{5 \pi}{7}\) \(-\cos \frac{6 \pi}{7}=\)
- A 0
- B \(\frac{3}{2}\)
- C \(\frac{3}{4}\)
- D 1
Answer & Solution
Correct Answer
(D) 1
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