tan2x＝0.5578
    tan2x＝0.481
    tan2x＝0.3755
    tan2x＝0.2698
    tan2x＝0.0.2698
    tan2x＝0.1926
    tan（2x）＝1.926
    tan2x＝1.982
    tan2x＝2.698
    tan2x＝2.698
    -1.07169=(1/x)*ln(1-x)
    0.625=x-3+4.57ln((x-4.57)/(3-4.57))
    2.25=xln((2-x)/(3-x))
    -0.75=xln((3-x)/(2-x))
    69.56-51.55（cos2x+sin2x）-7.81（cos4x+2sin4x）=0
    69.56-51.55（cos2x+sin2x）-7.81（cos4x+2sin4x）=0
    138.83-45.78sin2x-114.45cos2x-10.55cos4x-8.44sin4x=0
    138.83-45.78sin2x-114.45cos2x-10.55cos4x-8.44sin4x=0
    138.83-45.78sin2x-114.45cos2x-10.55cos4x-8.44sin4x=0
    138.83-45.78sin2x-114.45cos2x-10.55cos4x-8.44sin4x=0

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