Prove this identity please! (cosx-sinx)=1-sin2x

[From: ] [author: ] [Date: 11-06-06] [Hit: ]

name says it alll

(cosx-sinx)^2
= cos^2 x - 2sin x cos x + sin^2 x
= 1 - sin 2x
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Attn: You missed "^2"

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This is not an identity

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