sina+cosa=1/5(0

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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