Find cos pie /7 + cos 2pie /7 + cos 3pie /7+cos 4pie /7 +cos 5pie /7 +cos 6pie /7 + cos 7pie /7
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Cos 7pie/7=-1
Cos pie/7+cos 2pie/7+ cos 4π\7=-1
Cos 3π/7+cos 5π/7+ cos6π/7=
cos 2π=1
(-1)+(-1)+1=-2
Cos pie/7+cos 2pie/7+ cos 4π\7=-1
Cos 3π/7+cos 5π/7+ cos6π/7=
cos 2π=1
(-1)+(-1)+1=-2
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