Questions

$2 \cos \frac{π}{13} \cos \frac{9 π}{13} + \cos \frac{3 π}{13} + \cos \frac{5 π}{13}$

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detailed solution

Correct option is B

2cos⁡π13cos⁡9π13+cos⁡3π13+cos⁡5π13=2cos⁡π13cos⁡9π13+2cos⁡π13cos⁡4π13=2cos⁡π13cos⁡9π13+cos⁡4π13=2cos⁡π132cos⁡π2cos⁡5π26=0

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