已知-45°<α<135,sin(45°-α)=3/5,则cos2α/cos(45°+α)=?
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已知-45°<α<135,sin(45°-α)=3/5,则cos2α/cos(45°+α)=?
已知-45°<α<135,sin(45°-α)=3/5,则cos2α/cos(45°+α)=?
已知-45°<α<135,sin(45°-α)=3/5,则cos2α/cos(45°+α)=?
-90
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