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Prove cos^2(45 degrees+x)-sin^2(45degrees+x)= -sin2x?

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Prove cos^2(45 degrees+x)-sin^2(45degrees+x)= -sin2x?

trigonometric-functions
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asked Aug 22, 2015 in TRIGONOMETRY by anonymous

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1 Answer

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The trigonometric identity is .

Consider .

Apply double angle formula: .

Apply cofunction formula: .

.

.

answered Aug 22, 2015 by Sammi Mentor

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