a=(cos2x,sinx),b=(1,2sinx-1),x∈(π/2,π),若ab=2/5,则tan(x+π/4)=?
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a=(cos2x,sinx),b=(1,2sinx-1),x∈(π/2,π),若ab=2/5,则tan(x+π/4)=?
![a=(cos2x,sinx),b=(1,2sinx-1),x∈(π/2,π),若ab=2/5,则tan(x+π/4)=?](/uploads/image/z/20023866-18-6.jpg?t=a%3D%28cos2x%2Csinx%EF%BC%89%2Cb%3D%281%2C2sinx-1%29%2Cx%E2%88%88%EF%BC%88%CF%80%2F2%2C%CF%80%29%2C%E8%8B%A5ab%3D2%2F5%2C%E5%88%99tan%EF%BC%88x%2B%CF%80%2F4%EF%BC%89%3D%3F)
ab=cos2x+2(sinx)^2-sinx=1-sinx=2/5,sinx=3/5,x=2π/3,tan(2π/3+π/4)=tan(165度)
高中必修4向量a向量(cos2X,sinx)b向量(1,2sinx-1)x∈(π/2,π)若a向量×b向量=2/5则ta
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