Doubt

[vernal inlet]

if x = $\sin \left( \frac{2\pi}{7}
\right) + \sin \left( \frac{4\pi}{7}
\right) + \sin \left( \frac{8\pi}{7}
\right)$ and y = $\sin \left( \frac{2\pi}{7}
\right) + \sin \left( \frac{4\pi}{7}
\right) + \sin \left( \frac{8\pi}{7}
\right)$ then find x^2 + y^2

[lofty stirrup]

Chochan
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[vernal inlet]

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