已知sinα=1/3,2π
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已知sinα=1/3,2π已知sinα=1/3,2π已知sinα=1/3,2π(sinα/2+cosα/2)^2=1+sinα=4/32π
已知sinα=1/3,2π
已知sinα=1/3,2π
已知sinα=1/3,2π
(sinα/2+cosα/2)^2=1+sinα=4/3
2π
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