sina+cosa=-1/5,0

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sina+cosa=-1/5,0

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

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 已知sina+cosa=1/5(0 已知sina+cosa=-1/5(0 已知3sina+cosa=0求（1）（3cosa+5sina）/sina-cosa（2）sina+2sinacosa-3cosa 已知,5sina+2cosa=0,求sina*cosa 已知12sina+5cosa=0,求sina,cosa 已知sina+cosa=1/5,则sina*cosa= 已知sina+cosa=1/5求sinacosa,sina-cosa