sina+cosa=1/5,0
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sina+cosa=1/5,0sina+cosa=1/5,0sina+cosa=1/5,0由sina+cosa=1/5,和(sina)^2+(cosa)^2=1再加上条件0
sina+cosa=1/5,0
sina+cosa=1/5,0
sina+cosa=1/5,0
由sina+cosa=1/5,和(sina)^2+(cosa)^2=1
再加上条件0
sina+cosa=1/5,0
已知sina+cosa=1/5,0
设sinA+cosA=1/5,0
sina+cosa=1/5(0
sina+cosa=-1/5,0
知sina+cosa=1/5,0
已知sina+cosa=1/5,0
已知sina+cosa=-1/5,0
sina+cosa=-1/5,0
sina+cosa=1/5(0
已知sina+cosa=1/5,0
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