(sinx-cosx)²
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(sinx-cosx)²
(sinx-cosx)²
(sinx-cosx)²
=(sinx)^2-2sinxcosx+(cosx)^2
=(sinx)^2+(cosx)^2-2sinxcosx
=1-2sinxcosx
=1-sin2x
原式=sin²x+cos²x-2sinxcosx
=1-sin2x