已知sina=5/13,a∈(π/2,π),则sin2a=?cos2a=?tan2a=?sina/2=、cosa/2=?tana/2=?
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![已知sina=5/13,a∈(π/2,π),则sin2a=?cos2a=?tan2a=?sina/2=、cosa/2=?tana/2=?](/uploads/image/z/5500238-14-8.jpg?t=%E5%B7%B2%E7%9F%A5sina%3D5%2F13%2Ca%E2%88%88%EF%BC%88%CF%80%2F2%2C%CF%80%EF%BC%89%2C%E5%88%99sin2a%3D%3Fcos2a%3D%3Ftan2a%3D%3Fsina%2F2%3D%E3%80%81cosa%2F2%3D%3Ftana%2F2%3D%3F)
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已知sina=5/13,a∈(π/2,π),则sin2a=?cos2a=?tan2a=?sina/2=、cosa/2=?tana/2=?
已知sina=5/13,a∈(π/2,π),则sin2a=?cos2a=?tan2a=?sina/2=、cosa/2=?tana/2=?
已知sina=5/13,a∈(π/2,π),则sin2a=?cos2a=?tan2a=?sina/2=、cosa/2=?tana/2=?
sina=5/13,a∈(π/2,π),cosa=-根号[1-(sina)^2]=-12/13,sin2a=2sina*cosa=-120/169,cos2a=1-2(sina)^2=119/169,tan2a=sin2a/cos2a=-120/119 a/2∈(π/4,π/2)sina/2=根号[(1-cosa)/2]=5带根号26/26 cosa/2=根号[(1+cosa)/2]=根号26/26,tana/2=5
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