show-that-sin-2pi-5-sin-3pi-5-

Question Number 78815 by mathocean1 last updated on 20/Jan/20

show that

\sin \frac{2 π}{5} = \sin \frac{3 π}{5}

Answered by mind is power last updated on 20/Jan/20

\frac{3 π}{5} = π - \frac{2 π}{5}