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(cosx-sinx)^2 = 1-2sinx cosx
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(cosx-sinx)^2 = 1-2sinx cosx

User Jainarine
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1 Answer

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cos^2x - 2cosxcosx + sin^2x = 1 - 2sin x cosx

So cos^2x + sin^2x = 1
User Tftd
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