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	prove that `cos2pi/7 + cos4pi/7 + cos6pi/7 = -1/2 ` (Doubtnut) View
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	Prove cos(2pi/7) + cos(4pi/7) + cos(6pi/7) = -1/2 (Cam Du) View
	13. Cos 2π/7 + Cos 4π/7 + Cos 6π/7 = -1/2 13. Cos(2pi/7)+Cos(4pi/7)+Cos class 10 Trigonometry ex 9.3 (Bimal Sir G) View
	IIT JEE Math Questions: The value of cos2pi/7 + cos4pi/7 +cos6pi/7 (The Math Professor) View
	Cos (2 pi/7) Cos (4 pi/7) Cos (8 pi/7) = 1/8 @EAG (Elite Academy Guntur) View
	Prove that: cos 2pi/7 + cos 4pi/7 + cos 8pi/7 = -1/2 (Mr. Bidur Bastola) View
$Download Lagu Prove that: \[ \cos \frac{2 \pi}{7} \cos \frac{4 \pi}{7} \cos \frac...$	Prove that: \[ \cos \frac{2 \pi}{7} \cos \frac{4 \pi}{7} \cos \frac... (PW Solutions) View
	`cos.(2pi)/(7)+cos.(4pi)/(7)+cos.(6pi)/(7)` (Doubtnut) View
	The value of cos (2π/7)+cos⁡(4π/7)+cos⁡(6π/7) I JEE Master Concept Series I JEE Main Previous Year Q (A4S Hub JEE) View