sina+cosa=-1/5,0
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sina+cosa=-1/5,0sina+cosa=-1/5,0sina+cosa=-1/5,0x*x+y*y=1x=-3/5x=4/5x=4/5设sina=x,cosa=y→﹛→﹛或﹛因为0
sina+cosa=-1/5,0
sina+cosa=-1/5,0
sina+cosa=-1/5,0
x*x+y*y=1 x=-3/5 x=4/5 x=4/5
设sina=x,cosa=y→﹛ →﹛ 或﹛ 因为 0
sina+cosa=1/5,0
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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
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