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	cos^4x = 3/8 + 1/2 cos2x + 1/8 cos4x double Angle Application (Anil Kumar) View
	cos^4x \| = 3/8 + 1/2 cos2x + 1/8 cos4x (Mathe Genie) View
	prove that cos4x=8cos^4x-8cos^2x+1 (Seekho aur sikhao) View
	Proving Trigonometric Identity - cos(4x) in terms of cos(x) [cos(4x)=1-8cos^2(x)+8cos^4(x)] (Harold Walden) View
	Show sin^4 x = 3/8 - 1/2 cos(2x) + 1/8 cos(4x). Double Half angle Identities (Ms Shaws Math Class) View
	cos 4x = 1- 8 sin square x cos square x (dev classes Dehradun) View
	Prove that : cos4x = 1 - 8 sin²x cos²x (Pace Edu.) View
	Find Trigonometric Equation from Solution cos 4x - cos 2x = 7/8 (Anil Kumar) View
	Demuestre que cos^4x = 1/8 ( 3 + 4 cos2x + cos4x) (Daniel Montaño) View
	Trigonometric Quadratic Equation Challenge cos^2x plus cos4x (Anil Kumar) View