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(1999•天津)已知sinα+cosα=m,sinα•cosα=n,则m、n的...
(1999•天津)已知sinα+cosα=m,sinα•cosα=n,则m、n的关系是( )
A.m=n
B.m=2n+1
C.m2=2n+1
D.m2=1-2n
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