化简:y=cos2x+2sinxcosx-sin2x

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化简:y=cos2x+2sinxcosx-sin2x
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化简:y=cos2x+2sinxcosx-sin2x
化简:y=cos2x+2sinxcosx-sin2x

化简:y=cos2x+2sinxcosx-sin2x
y=cos2x+2sinxcosx-sin2x
=cos2x+2sinxcosx- 2sinxcosx
=cos2x
=2(cosx)^2-1