perplexus.info :: Just Math : Sine-full Pi

Sine-full Pi (Posted on 2007-11-14)

Show that:

sin(2*pi/7) + sin(4*pi/7) + sin(8*pi/7) = √7/2

Note: All the angles are in radians.

See The Solution Submitted by K Sengupta

Rating: 2.3333 (3 votes)

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