你少打sin了
sin2x-cos2x=√2（√2/2*sin2x-√2/2*cos2x)=√2(cosπ/4*sin2x-sinπ/4*cos2x)=√2sin(2x-π/4)
f(x)=sin2x-cos2x怎么变成=√2(2x-π/4)
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