sina+cosa=-1/5,0

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sina+cosa=-1/5,0sina+cosa=-1/5,0RTsina+cosa=-1/5,0(sina+cosa)^2=1/252sinacosa=-24/25(sina-cosa)^2=49

sina+cosa=-1/5,0
sina+cosa=-1/5,0RT

sina+cosa=-1/5,0
(sina+cosa)^2=1/25
2sinacosa=-24/25
(sina-cosa)^2=49/25
sina-cosa=±7/5
∵0∴sina-cosa=7/5
则形成方程：
sina+cosa=-1/5
sina-cosa=7/5
得cosa=-4/5
sina=3/5
tana=sina/cosa=-3/4

-3/4

-4/3

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