已知角a的终边落在直线x+y=0上,则2sin+cosa= 设tana=2,则2sin^2a-3sinacosa+cos^2a= 已知sina+cosa=-1/5.已知角a的终边落在直线x+y=0上,则2sin+cosa=设tana=2,则2sin^2a-3sinacosa+cos^2a=已知sina+cosa=-1/5.则sinacosa=已知sinO-c
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![已知角a的终边落在直线x+y=0上,则2sin+cosa= 设tana=2,则2sin^2a-3sinacosa+cos^2a= 已知sina+cosa=-1/5.已知角a的终边落在直线x+y=0上,则2sin+cosa=设tana=2,则2sin^2a-3sinacosa+cos^2a=已知sina+cosa=-1/5.则sinacosa=已知sinO-c](/uploads/image/z/1801931-59-1.jpg?t=%E5%B7%B2%E7%9F%A5%E8%A7%92a%E7%9A%84%E7%BB%88%E8%BE%B9%E8%90%BD%E5%9C%A8%E7%9B%B4%E7%BA%BFx%2By%3D0%E4%B8%8A%2C%E5%88%992sin%2Bcosa%3D+%E8%AE%BEtana%3D2%2C%E5%88%992sin%5E2a-3sinacosa%2Bcos%5E2a%3D+%E5%B7%B2%E7%9F%A5sina%2Bcosa%3D-1%2F5.%E5%B7%B2%E7%9F%A5%E8%A7%92a%E7%9A%84%E7%BB%88%E8%BE%B9%E8%90%BD%E5%9C%A8%E7%9B%B4%E7%BA%BFx%2By%3D0%E4%B8%8A%2C%E5%88%992sin%2Bcosa%3D%E8%AE%BEtana%3D2%2C%E5%88%992sin%5E2a-3sinacosa%2Bcos%5E2a%3D%E5%B7%B2%E7%9F%A5sina%2Bcosa%3D-1%2F5.%E5%88%99sinacosa%3D%E5%B7%B2%E7%9F%A5sinO-c)
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