1. Tardigrade
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  3. Mathematics
  4. If the value of cos (2 π/7)+ cos (4 π/7)+ cos (6 π/7)+ cos (7 π/7)=-(ℓ/2). Find the value of ℓ.

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Q. If the value of $\cos \frac{2 \pi}{7}+\cos \frac{4 \pi}{7}+\cos \frac{6 \pi}{7}+\cos \frac{7 \pi}{7}=-\frac{\ell}{2}$. Find the value of $\ell$.

Trigonometric Functions

Solution:

Correct answer is '3'