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Prove cos^6x-sin^6x=cos2x-1/8sin4xsin2x?

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Trignometry help

trigonometric-identities

asked Aug 22, 2015 in TRIGONOMETRY by anonymous

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1 Answer

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The trigonometric identity is .

Consider .

Apply formula: .

Apply double angle formula: .

Apply Pythagorean identity: .

Apply double angle formula: .

.

.

answered Aug 22, 2015 by Sammi Mentor

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