知sina+cosa=1/5,0
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知sina+cosa=1/5,0知sina+cosa=1/5,0知sina+cosa=1/5,01.(sinα+cosα)2=1/25sinα2+cosα2+2sinαcosα=1/25所以sinαc
知sina+cosa=1/5,0
知sina+cosa=1/5,0
知sina+cosa=1/5,0
1.(sinα+cosα)2=1/25
sinα2+cosα2+2sinαcosα=1/25
所以 sinαcosα=-12/25
sinα2+cosα2+2sinαcosα-4sinαcosα+4sinαcosα=1/25
(sinα-cosα)2+4sinαcosα=1/25
(sinα-cosα)2=1/25-4sinαcosα=49/25
因为 0< α
Sina CosA=1/5
平方得 1+2SinaCosA=1/25
得SinACosA=-12/25
(SinA-CosA)^2=49/25
SinA-CosA=7/5或-7/5
SinA-CosA=7/5时Sina=4/5 Cosa=-3/5 Tana=-4/3
=-7/5 -3/5 4/5 -3/4
知sina+cosa=1/5,0
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
已知sina+cosa=1/5,0
已知sina+cosa=-1/5,0
sina+cosa=-1/5,0
sina+cosa=1/5(0
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