求证(sin2α-cos2α)^2=1-sin4α

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求证(sin2α-cos2α)^2=1-sin4α

求证(sin2α-cos2α)^2=1-sin4α
求证(sin2α-cos2α)^2=1-sin4α

求证(sin2α-cos2α)^2=1-sin4α
(sin2α-cos2α)^2
=1-2sin2acos2a
=1-sin4a