已知cos(4/派+x)=5/3求sin2x-2sin2x/1-tanx
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已知cos(4/派+x)=5/3求sin2x-2sin2x/1-tanx
已知cos(4/派+x)=5/3求sin2x-2sin2x/1-tanx
已知cos(4/派+x)=5/3求sin2x-2sin2x/1-tanx
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