y=1-4sin²xcos²x的导数y'=
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y=1-4sin²xcos²x的导数y'=
y=1-4sin²xcos²x的导数y'=
y=1-4sin²xcos²x的导数y'=
y=1-(2sinxcosx)2
y=1-sin(2x)2
y'=-2sin2x*cos2x*2
y'=-2sin4x
-sinxcosx