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	`cos A cos 2A cos 4A..........cos 2^(n-1) A` (Doubtnut) View
	Prove that: CosA.Cos2A.Cos2²A.Cos2³A...........Cos2⁽ⁿ⁻¹⁾A=Sin2ⁿA/2ⁿSinA.. (LUNJAPAO BAITE) View
	trigo: CosA.cos2A.cos4A.cos8A... (IIT JEE MATHS(IX,X,XI,XII) BY B K SIR (FIITJEE)) View
	TRIGONOMETERY PROVE THAT 1 + cos 2A + cos 4A + cos 6A = 4 cos A cos 2A cos 3A. (Math Solution) View
	If a=12 prove cos2a .cos4a.cos8a .cos14a = -1/16 (Ford Tech) View
	76Trigonometry Show that Cos A Cos 2A Cos 4A Cos 8A = Sin 16A / 16Sin A (AIMSDARETOSUCCESS) View
	Cos^4A-Cos^2A=Sin^4A-S..,Cot^4A-1=Cosec..,Sin^4A+Cos^4A=1-2Sin^2A..,Sin^6A+Cos^6A=1-3Sin^2A...\|Lec40 (Maths Pulse - Chinnaiah Kalpana) View
	Proof of Cos 2A + Cos 2B + Cos 2C = -1 - 4 Cos A Cos B Cos C. (Our Math Channel) View
	Proving Cos2A = 2 Cos^2A – 1 = 1 – 2Sin^2A = Cos^2A – Sin^2A (Competition Pandit) View
	Prove that sin^2a+cos^4a=cos^2a+sin^4a (Ford Tech) View