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∵tanα+cotα=52,∴sinαcosα+cosαsinα=52,則2sin2α=52,sin2α=45,∵α∈(π4,π2),∴2α∈(π2,π),∴cos2α=−1−sin22α=35,sin(2α+π4)=sin2α.cosπ4+cos2α.sinπ4=45×22−35×22=210.
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